Shitstamp
This occurs when your performing anal sex and the gender of your choice shits on your dick. Then you smack them in the face with your penis tip leaving a brown mushroom stamp.
“Dude I shitstamped Tina so hard that the shit wouldn’t come off her face!”
Shitstamp
when you have wiped your ass so many times and have such ring of fire that you literally can only take a wad of toilet paper and stamp it on your ass in hopes of wiping excess crap
after eating a wicked meal of extra spicy indian food and having the runs i was eventually forced to shitstamp myself