If Oscar night and a scattering of “out there” movie and series turns hadn’t made it obvious, that darned John Cena is pretty Down for Anything.

Nude “Best Costume” presentation, or dressing up as Alice Cooper or Britney Spears in “Baby One More Time” schoolgirl gear, Cena lays it on the line — showing off the sight-gag bod and crackling timing of probably the funniest wrestler turned actor of them all.

All those rock star poses — complete with singing R-rated versions of “Whip It,” “White Wedding,” etc. — are the funniest bits of “Ricky Stanicky,” a bloated groaner of a comedy from Peter Farrelly.

Cena is far and away the best and almost the only funny thing in this farce, whose director must like working with Zac Efron (“The Greatest Beer Run Ever”) and the idea of putting the Oscar winning “Green Book” further behind him as he revisits the hit-or-REALLY miss farces of his “Dumb and Dumber” past.

Cena plays Rod Rimestead, aka “Rod Hard Rob,” a flailing Atlantic City showman whose act is masturbation-themed parodies of pop and rock hits of the past. His life changes when he meets three jerks who have lied their way into a weekend in Atlantic City away from their significant others.

Sadly, “Ricky Stanicky” is about the lives of Providence, Rhode Island’s own lie-on-the-fly king Dean (Efron), “organic” “natural” stick-up-his-bum J.T. (Andrew Santino) and never-found-his-calling Wes (Jermaine Fowler), three pranksters who invented an imaginary bestie to get out of trouble in childhood — they set a house on fire — and clung to that friend, complete with fake online identity, cell phone and legend into adulthood.

These three use some crisis or need to meet-up with Ricky Stanicky as their way of getting out of all sorts of things, including the baby shower Dean and TV reporter girlfriend Erin (Lex Scott Davis) are throwing for J.T. and his wife (Anja Savcic).

The aimless, indulged and supported-by-his-partner Wes, who is gay, uses Ricky excuses to escape “living in a gay ‘Handmaid’s Tale,'” which is how he describes his life. Yeah, they’re brats, nobody’s idea of adults.

Sporting events, concerts, guys’ nights out, “weekends,” Ricky has always come through, although wives, partners and relatives scratch their heads over a guy they’ve never met.

But the baby shower transitioned into premature labor and J.T. missed the birth of his son. His furious mother-in-law (Heather Mitchell) demands to meet him and others chime in. Either come clean, or double down on the lie with a “Ricky.” That out of work actor nicknamed Rock Hard Rod? He’s “available.”

The most amusing elements of the movie — AFTER Cena’s on-stage singing shtick — are how deep “sloppy drunk” failed-actor Rod gets into character. The lads kept a “Bible” of their Ricky lies, details of his life to keep others from tripping them up with questions about details. Rod memorizes it.

Ricky’s a few years sober? Vomiting, withdrawal Rod jumps on the wagon. Ricky’s a non-profit do-gooder in Africa? Rod enters the Bris in a safari hat, filled with Bono stories and facts at his disposal about the perils facing the planet and the good works he’s involved in. He charms most — “Churn my butter with a slippery stick!” — convinces (sort of) the mother-in-law, and even insults Dean and J.T.’s financial firm boss (William H. Macy) in true self-righteous eco-warrior fashion.

“Whatever helps you sleep at night, Ebeneezer.”

Things get out of hand. Rod’s past is pursuing him in the form of a couple of mugs. The lies are so convincing there’s sure to be repercussions for the Providence Prevaricators. Is having a real Ricky Stanicky in everybody’s lives really what the three con-stooges have in mind?

The energy in the picture falls off a cliff after the introductory scenes, which climax with the bris. Jeffrey Ross has a cameo as a shticky rabbi who gets amusingly “k-holed,” and it’s pretty much all downhill after that.

The former Farrelly brand, beaten into us when Peter and Bobby Farrelly were The Farrelly Brothers, is revived here — off-color one-liners and “Oh no they didn’t” go theres leaving no subject sacred, vomiting and bodily function humor, alcoholism as a punch line, etc. — and wears out its welcome in record time.

And yet the movie persists, pointing us toward some sort of long-delayed squishy finale that doesn’t tickle, touch or leave a pleasant taste in the mouth.

Like too many of his movies of late, the idea here is to “See it for Cena,” as the film around him isn’t up to the big funny man’s big, scenery-devouring turn.

Rating: R, substance abuse, drug jokes, profanity, vulgar content

Cast: Zaf Efron, John Cena, Lex Scott Davis, Andrew Santino, Jermaine Fowler, Heather Mitchell and William H. Macy.

Credits: Directed by Peter Farrelly, scripted by Jeff Bushell, Brian Jarvis, James Lee Freeman, Peter Farrelly, Pete Jones and Mike Cerrone. An MGM/Amazon Prime release.

Running time: 1:53