Top Definition
An onomatopoeia often used in manga for when someone with large breasts walks up to (or past) a male character.
In "Higurashi: When They Cry" vol. 1, page 41, the sound effect is portrayed when Mion walks past the main character.

Busty character walks by "badum".
by Stiffofdeth June 06, 2009
The word badum means to be a complete and total idiot and retard. It is a combination of Dumb, Bum and Duh.
Lots of people have been recently using the word refering to the patients in a crack house..
1)Dude! Look at him, he can hardly stand up straight! He is either drunk or badum!
2)Guy 1: what is 2 +3 equal to?
guy 2: is that a trick question?
Guy 1: uh, you are the definition of the word badum..
by gamer13 - Hans Sperling September 22, 2006
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