1. obviously correct so much so that no further consideration is required to find out whether it is correct.
2. (of a girl) not allowing oral sex.
1. The student gave a no-brain answer.
2. Do you like no-brain girls?
by uttam maharjan November 12, 2010
Someone so clueless, stupid, or oblivious that you are certain they have nothing between their ears.
I can't believe Jon can't use a tape measure. What a no brain.
by theidgasking March 23, 2014
3l337 godfather of all things 0wnag3
n0_131241N
This little guy stole my woman, then dumped her. What a guy! Whooooo!! He always whipps muh ass in Counter-Strike and Unreal Tournament
dude!!!!1!!11!111! n0_131241N just pwned the living hell out of me! Hell he is sexy!
by nicky b December 30, 2003

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