back shat 

The result of a massive shit taken in one's pants, where the amount of poop is so much that it has nowhere to go but out the top. Typically happens to babies in diapers but it is also known to have occurred with fat, drunk bitches who can't get out of pants that are too tight in time to take a shit.

Person 1: What's all that brown stuff coming out of that chick's pants?

Person 2: I think she just back shat herself.

back shat by The Hot Karl January 1, 2011

backshat 

an indicator of speed amongst mountain bikers where the higher the shat mark on your back, the higher the speed you're carrying.

"Damn bro i was brapping those berms so fast i got some serious backshat on the way down!"

backshat by alpentaldick November 20, 2020

backshat 

an indicator of speed amongst mountain bikers where the higher/longer the shat mark on your back, the higher the speed you're carrying.

"Damn bro i brapped those berms so fast i got some serious backshat on the way down!"

backshat by alpentaldick November 20, 2020