mudflap 

Verb. flicking the sphinkter anus of the girl you are having sex with.
While screwing doggy-style, flick the girls unsuspecting "brown eye" to send a shock-wave through her body. This causes her vagina to tighten and increases pleasure for the guy. The girl will experience some discomfort.
Warning: performing the mudflap will result in future trust issues!!

Travis: my chick was such a bitch today!
Kev: so are you gonna dump her?
Travis: No way, Im gonna give her such a mudflap tonight!!

mudflap by Clinton Howes February 20, 2008

mudflap 

a vagina with a ball sack underneath, but the sack has no balls in it

allison plays with her mudflap often

mudflap by poopsnatch January 24, 2008

mudflap 

a mudflap is where your girlfriend shits on your stomach and then drags her vagina through it.

Man1: Dude wheres your girlfriend?
Man2: She's in the hospital.
Man1: Why?
Man2: I gave her a serious mudflap last night and shes still recovering
Man2: Niiice!!

mudflap by your fucking dog December 9, 2011

mudflap 

Homosexuial's Foreskin

mudflap by Zyklon-B October 1, 2003

Mudflap 

v. The act of motorboating another man's butt cheeks.

Justin loves to mudflap men on the weekends.

Mudflap by suckitcarley March 28, 2015

mudflap 

When a chick has a real sloppy ass and her cheeks hang downlow.

MAN check out the mudflaps on that bitch!

mudflap by Pablo Honeys April 10, 2007

mudflap 

The purpose a scrotal sack serves on a fag.

I've only heard about it. Never done it.

mudflap by STR8 DOOD August 27, 2003