Bajimbajam
From Canadia, the website
Origin: Bajimbajam originated from a comic by Zack, as an action word, like "POW!". File was using it a lot when we were playing Lord of the Rings and fighting some stooges. He would shout out bajimbajam randomly, and occasionally bajimbasam if Sam got a hit.
Definition: Bajimbajam is an exclamation used for a successful hit in a game or whatever the hell you feel like using it for.