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Daboomchi is when you totally wreck someone else and make them feel like a total loser. You shout it with extra boom and a bunch of yeah uhs to make it even more annoying.
Yeah uh daBOOMMMchi!! (said after beating up a guy in a video game)
Daboomchi!! (texted to someone who failed a math test)
Yeah uh daBOOMMMchi!! (yelled at the lunch table after someone spilled their soda on them)