Ja Rule Calls 50 Cent an Idiot, Plugs Def Comedy Jam-Style Event

Ja Rule's reiterating his feeling that 50 Cent is an "idiot" for hurling a mic that could earn him a felony charge, but he's also telling TMZ Hip Hop ... the moment's in his rearview mirror.

The "Holla Holla" rapper's already looking toward the future of his upcoming comedy special, which happens next month!!!

We caught up with Ja Thursday night outside TV personality Josh McBride's birthday party at Somewhere Nowhere NYC, and he blew off his recent digs at his archnemesis.

ICYMI, 50 clowned Ja for, in his eyes, reenacting "The Passion of Christ" at a recent show ... but then Ja barked back -- going more viral -- by bringing up the criminal battery probe associated with 50 injuring Power 106 radio host, Bryhana Monegain with the mic he threw.

Ja spared the crowd the holy antics inside Josh's party, delivering only hits, but revealed to us he plans on giving fans a different form of entertainment come Oct. 25 - 27 when he takes over Harlem's Apollo Theater for his "Laughing It Up" comedy series.