The combination of fecal matter and semen that accumulates under your foreskin after unprotected anal sex
"Dude I had sex last night and have all this shit under my dick skin"
"Oh yeah man, that's undercover truffle butter. You gotta wrap it up or make him shit first"
"Oh yeah man, that's undercover truffle butter. You gotta wrap it up or make him shit first"
by Umgowa July 19, 2017
Get the Undercover truffle buttermug.