that sudden bolt of fear and regret when you realize your fart was actually a wet shit, aka a shart.
the attackee often slides his/her hand into her shorts for confirmation.
"Last night you totally could have made out with that chick. Why'd you bail?"
"Dude, I was gonna float an air bisquit.... but I swear I felt some fluid in there. I had a shart attack and had to pull the ripcord before I fully shit my pants."