a term that means totally awesome. like unbelievably, completely, stupendously, amazing!! when something is so cool, cool just doesn't cut it. it can also include a fist pound or high-five with it.
Bob: I just won 1,000,000,000 dollars in the lottery!!!
John: BOOMSHAKALAKA BOOYAKASHA!!!!!!
Perry: I just totally nailed that that smokin, blonde chick.
Turk: Boomshakalaka Booyakasha!! YA NO WAT IM SAYIN!?!?!