A group of 7 or mor gay men, stand in a circle with a piece of bread. The first man jizz's on it and passes it to a random person, so on and so forth. The last person who gets the breat has to unload his special sauce on it, and then eat the bread himself.
Wow man, that sour dough lastnight was epic. I cant believe Eric ate the whole thing!
What a woman's fingers or hands smell like after having sex. However, they do not smell like sour dough if she has only been masturbating herself (this is an important distinction to make).
"Oh yeah, if I'm just masturbating myself, uh, then why do my fingers smell like sour dough?!"
(Upon having received a high-five from someone who just "got her some of that"): "Sniff, sniff, sniff... sour dough?"