Top definition
n. slang term for butt, usually used by little children, but not limited to them.
Kid 1: Hey watch me!
Kid 2: Watch out!
Kid 1: Ow... I think I just fell on my boompsie...

Guy: Hey giiirrrll, I really like your boompsie.
Girl: What??
Guy: Nothin', nothin... barkeep!
by Slimjimnabil May 12, 2007
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