I've Died Laughing At My Own D's definitions

dry sauce

Dry sauce is what is left over after ejaculation that wasn't wiped off. Therefore, over time, this leftover will turn white and dry (usually leaving a stain of sorts).

Girlfriend: "What's that on your underwear?"
Boyfriend: "That's dry sauce from last night, baby."

by I've Died Laughing At My Own D May 11, 2017