Top definition
An instance where, no matter what you say afterwards, saying (absolutely) anything in defense of yourself will just make the situation much, much worse. If a brain bomb occurs, it is best to shu your trap and either

a: take the aftermath as a man, or
b: get the hell outta dodge.

Most commonly, this is done by a man to his wife, or by a man in general.
Instructor: ...What could possibly have driven this female to do such a thing?

Male student: Must have been that time of the month.

All female students in the room: *Gasp*

Male student: Damnit, brain bomb.
by Boxymoron2 March 22, 2006
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