An onomatopoeic "in your face." Originally the sound of a slam-dunk in basketball -- the "boom" being the dunk, and the "shakalaka" being the rattling of the backboard.
Pippen over to Grant ... he shakes and bakes ... to the basket ... BOOMSHAKALAKA! (NBA Jam announcer)
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