(Noun)
Someone whom you don't know who's done something admirable or something you personally find great. Whoever the guy is probably has a massive horsecock because what he did was so good.
"yo I was in the drive-thru at McDicks and old dude in front of me in a beemer paid for my food let's fuckin GOOOOOOOOOOOOOOO"
"lol nice. who did that shit?"
"man idk, some horsecock motherfucker, that's all I know."