when you fuck her so hard in the ass she shits a lil and you take that dick out and shove it straight into her pussy, truffle butter is that mix of cum from her dripping wet pussy and her shit
bitch imma fuck you so hard you'll end up with truffle butter all over that pussy
Truffle Butter is when you are having anal sex and you put your penis inside of the vagina again, and it creates a brown~ish~tan buttery substance around the vagina.