It's like snot from your nose, except it is primarily lodged in the rectum. Forms from excessive anal sex.
I wiped the dook off my ass, but instead there was butt snot.
by Ricky Martin January 29, 2007
It is when you have diarrhea so bad that when you go to wipe your ass instead of there being poop there is something that looks like snot.
mom take me to the doctor I think I have butt snot
by Tmoney0422 April 05, 2015