A exclamation either when the exclamator destroys something or does something wicked awesome.It is usually screamed when something is set on fire or exploded. it is also screamed when somebody does a stunt or a backflip or......something cool......like that.
(throws a 20 pack of fire crackers into a bon fire. this results in large noises and lotsa, lotsa explosions)Random Dude: Boomshackalacka
to eat cow dung or a celebration
i want to boomshackalacka