-noun
An offered or requested postponement of a thought. Usually due to the influence of mind-altering substances. Or being a moron.
Guy 1 "DUDE ok so last night- "
Guy 2 ".....Last night- what?"
Guy 1 "Shit son, I forgot, I'm gonna have to write you a brain check on that one."
by Rob the Baller February 05, 2008
When a girl is dying to give you some head but you just aren't in the mood for it -- you ask her for a braincheck.
Tim: Vicky really wanted to give me a blow job last night...

Ryan: So did she?

Tim: Nah, I had just hooked up with her room mate, so I asked her for a braincheck.
by J Ganthier August 18, 2008
When a girl is dying to give you some head but you just aren't in the mood for it -- you ask her for a brain check.
Tim: Vicky really wanted to give me a blow job last night...

Ryan: So did she?

Tim: Nah, I had just hooked up with her room mate, so I asked her for a brain check.
by J Ganthier August 18, 2008

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