The only thing I really know about this Teemo guy is that I once lost to one of his animations on the daily five and he seemingly can't take criticism to save his life, even if it's constructive.
Also the animation he made where the guy fucks his sister made me irrationally angry, not because it's porn, but rather how he kept saying it was a "joke", although the quality of it was ON-PAR with the rest of the lewd animations he does.
It also didn't help that the girl also looked quite suspiciously young in that too.
Of course, I don't have a problem with NSFW artists, unless if they actively endanger children or make genuinely problematic stuff, like the incest "joke" animation he did.
I'm not surprised that he's somewhat infamous on this site because of him doing stuff like that and he (rightfully) deserves to get ridiculed.