a word you say when you want to surprise someone or scare the crap out of someone.
Dude 1: Hey guess what?
Dude 2: What?
Dude 1: .....
Dude 2: Okay...
Dude 1: SHA-BAM!
Dude 2: SHIT!
Girl 1: Where the hell is everyone?!
Group of Stupid Girls: SHA-BAM! Happy Birthday!
Girl 1: Dude you fucking surprised me!