When you have a heart attack and shit yourself at the same time.
Me: Oh man, I just slammed 8 jagerbombs in a row.
Bro: You'll give yourself a shart attack doing that!
Me: Too late...
When a group of guys go out to eat at a greasy buffet for the purpose of giving themselves diharrea. As their stomachs hurt worse, they take turns farting as hard as they can until one unlucky soul shits his pants in front of his friends.
"It was a wild night out with the boys, Will totally lost the Shart Attack"
This action defines when one sharts almost on themselves which is beyond their control because of loss of their sphincter muscle; usually is a watery shit or soft loose excrement; pre diarrhea
Damn Laura you having a shart attack baby? You already plastered the inside of the commode earlier and I don’t have a scrubber.