Red Velvet Truffle Butter is when you pull you dick out of the asshole an continue fucking her pussy while she's on her period. The substance around her pussy is red velvet ruffle butter (cum mixed with period blood).
Baby, I didn't know you were on your period, now you got red velvet truffle butter happening.
Strawberry truffle butter is when you pull your dick out of the asshole and continue fucking her pussy when she is on her period, and the red/tan buttery substance around her pussy is strawberry truffle butter.
Truffle butter is created when you pull your dick out of the asshole and proceed to fuck her in the pussy, the fecal matter, vaginal juices and semen combine to form a tan buttery substance in and around her pussy; truffle butter.
Black truffle butter is created when the woman is menstruating.
The entomology of the term stems from the English black pudding or the French boudin noir, both made with blood.
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"