Drake didn't only kill Meek Mill onstage at OVO Fest ... he burned him backstage too -- sharing a HUGE laugh with Kanye West and Will Smith.
Rumor is ... the superstars went all LMFAO over a meme Drake used to mock his rival. Check out the video ... it's hard to make out what's on Will's iPhone screen, but THEY think it's hysterical.
What is 100% clear -- Will looks really tight with Toronto's favorite son! Damn, Meek.
So much for, "In West Philadelphia born and raised ..."
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