When you need to do a shit badly; but then suddenly disappears only to come back an hour later with extreme force
may result in shitting yourself or a poo tickle
Aw man! i was with Bek last night and we started messing around...and wen she took off my pants i had a surprise shit ambush!
The other day John was trying to play a joke on me and mooned me from his car; only to have the joke on him wen he bent over and had a shit ambush all over his steering wheel