Definitions by The Hard-on Boys

Mississippi Mud Flap 

When a man cums on a woman's asshole and lets it dry, thus creating a covering over her hole resulting in a "flap" of dried seminal fluid the next time she takes a shit.

Hey bro, I gave my girl a Mississippi Mud Flap last night, that shit was savage 😂

Mississippi Mud Flap by The Hard-on Boys January 29, 2018