Usmc1371's definitions
The act of shitting ones self while wearing tighty whities and quickly ripping them off and flapping them over the head of an unsuspecting bystander.
"Dude! I totally give that bitch Shelly an irish mud flap last week...I'm pretty sure she had to shave her head!"
by Usmc1371 January 7, 2016
Get the irish mud flapmug.