Mustard Nut Share definition Flag When your cum is thick and yellow like mustard. I had to piss so bad but Lauren wouldn't stop with the head! so when i came all over her face it was mustard nut. Mustard Nut by Chuck Bucket March 1, 2005 0 0 Get merch Get the Mustard Nut mug. Buy Now — $32.95 See more merch