twatmustard Share definition Flag 1. a large amount of seaman in the pupic hair after a very intense jerk-off session. ah shit look at all the twatmustard "HEY REGINA! CAN U LICK OFF ALL MY TWATMUSTARD" twatmustard by sds August 28, 2005 0 0 Get merch Get the twatmustard mug. Buy Now — $32.95 See more merch