A dependable friend, partner, or acquaintance of either sex whom one can always approach for butt-sex at any time of day or night and who is eager to be the ass-pounder or -poundee.
Claire: "Why do you keep looking over at Greg?"
Stephanie: "Oh, he's just my comrade cornhole, and I need to get my ass pounded tonight."
Claire: "Wow, you're a lucky girl! I need to find my own comrade cornhole!"