Definitions by MikeAllen

duck butter 

Substance that results from the mixing of semen and vaginal fluids that rolls down the nut sack and grundle after unprotected sex. Once mixed, if left unattended, a sticky residue will result on the nut sack and grundle with a profound citrus like smell.

Fuck man, wash up after gettin some I can smell your duck butter from over here.

duck butter by MikeAllen September 1, 2004