Porn legend Ron Jeremy says there's NO WAY Ric Flair banged more than 10,000 chicks ... telling TMZ Sports, in his opinion, it just ain't possible.
Jeremy knows a little something about ... um, puttin' in work. He's been named #1 on AVN's 50 Top Porn Stars of All Time ... and when we talked to him, he said he ain't buyin' what the Nature Boy is sellin'.
"To overview, I think he's lying."
Jeremy explains why he thinks Naitch is fibbing, saying that number would require a full-time woo-hoo regimen that he doesn't think Flair is humanly capable of.