“Training Day” becomes “Coming of Age Day” in “LUV,” a clumsily violent attempt at grafting two reliable genres together into one somewhat edgy picture.

Rapper turned actor Common has one of his best roles ever as Uncle Vincent, an ex-con still trying for that big score, that “legitimate” business that he’d love to start if only the bank will turn a blind eye to his past and gamble on his future.

“I’m gonna be my own boss,” he brags to them.

They aren’t buying it.

So he lives with his mom (Lonette McKee), dresses like the businessman he isn’t and drives a shiny Mercedes. And on occasion, he pitches in raising his sister’s son, Woody (Michael Rainey Jr.) who idolizes him.

Dropping the 11 year-old off at school, Vincent sees how shy Woody is around girls, and decides that even at 11, the boy needs a different sort of schooling, a day of “what it takes to be a man.”

He drags the kid around so Woody can Be Like Vincent, from a ridiculously quick trip to Vincent’s tailor (not even kids can get a custom suit in an hour or so) to the deals his uncle makes to get by – increasingly violent deals with hoodlums both old school (Danny Glover, Dennis Haysbert).

Vincent has useful advice – “Don’t be looking down at your feet. The way you walk tells people everything they need to know about you.”

And the assorted players they run across approve of this sort of schooling – “Bring Little Barack with you.”

Woody experiences his first crab-cracking (the story is set in Baltimore), his first drink and sees his first dead body. All that’s for starters.

Director and co-writer Sheldon Candis does so well with those scenes, dominating “LUV’s” first half, that it’s surprising he has so much trouble introducing, bit by bit, Vincent’s violent world to Woody. This is an R-rated drama without the weight to support that rating, more a PG-13 coming-of-age tale that needed to be watered down.

The absurd turns the story takes to serve up streetwise and bloody “life lessons” for the kid will make any parent blanch and any movie lover roll his or her eyes.

MPAA Rating: R for violence, language, child endangerment and some drug content

Cast: Common, Michael Rainey Jr., Dennis Haysbert, Meagan Goode, Lonette McKee, Danny Glover, Charles S. Dutton

Credits: Directed by Sheldon Candis, written by Justin Wilson and Sheldon Candis. A BET/Indomina release

Running time: 1:34