Conor McGregor -- 'Most WWE Guys Are P*****s' ... Brock's 'Juiced up to the Eyeballs' (AUDIO)

Conor McGregor just UNLOADED on the WWE -- saying most of the pro wrestlers are "p**sies" -- and blasted Brock Lesnar as a juiced up cheater.

McGregor was on a conference call to promote UFC 202 when he was asked if he'd ever consider doing a stint in the WWE ... and that's when he went off.

"I haven't really thought about it," McGregor said ... "For the most part, those WWE guys are p**sies."

"They're messed up p**sies if you ask me."

McGregor said there are some people he respects over there -- including the McMahons, Triple H and The Rock.

But when asked about Brock Lesnar ... he fired even more shots.