A word used when making someone flinch. Usually a quick fist wave in front someone's face when they're not expecting it.
Used with extra O's when you really get someone good.
Can be used when actually hitting someone or something(by accident or intentionally).
Can also be used with additional words.
Jake: Hey Annie?
(Jake swing's his fist towards Annie's face as she turns around to look at him)
Annie: ahhhhhhh!!! (as she bumps into the table)
Sue: That's a BOOSH TABLE BOOSH!!!