Top definition
The slightly incapacitated state of mind after a proper, vigorous fucking... and at least one orgasm.
You're under the influence of fuck brain, dude... you just asked me to MARRY you!!! LOL
by Scrappy SamCat January 28, 2009
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Feb 26 Word of the Day
Commonly used in text messages or social media as a short form for Very Sound Advice.
Mate 1: Hey, I'd be careful risking all that money on one bet. Only risk what you can afford to lose.
Mate 2: Thanks. VSA
by Sexucator February 08, 2021
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2
1. A person who impedes the flow of traffic on two lane highways by driving far below the speed limit.

2. A person who makes a stupid move while driving a car.
1. That stupid fuck brain is doing 35 MPH in a 55 zone!!

2. That stupid fuck brain!! They don't know how to drive. Look, they're all over the road!!
by Dan of Earth February 20, 2005
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3
A person who always thinks of fucking and girls.Unless his homo.
Hey that asshole is a fuckbrain!
by Gedz0rt100 November 17, 2009
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4
Someone who has been fucked/fucked up in the brain, thus making them totally stupid, foolish, or just ignorant.
A drug user...
by Anonymous August 19, 2003
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5
Someone who never uses common sense, like engineers and people who just don't get life.
A board is cut 1/8" short and their micromiter mind says it's off. You kindly reply "It's a house not a hydrolic pump FUCK BRAIN !

You screwed his girl friend, of course he's pissed, FUCK BRAIN !
by unomee May 08, 2006
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6
Someone thats been fucked in the ear and can now cum out of any part of their body because of all the cum in their head.
Cathleen is a fuck brain because she likes to get fucked in the ears.
by Dick Face March 18, 2004
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