Mississippi Mud-Flapper Share definition Flag When a guy shits in a girls vagina then proceeds to eat her out. Dude...she wanted to do a Mississippi Mud-Flapper last night and it went all over the wall Mississippi Mud-Flapper by LOVESTUMP June 11, 2018 0 0 Get merch Get the Mississippi Mud-Flapper mug. Buy Now — $32.95 See more merch