Top Definition
A derivative of brain and fag, brainfag can be used to convey multiple meanings.

1) When your brain stops thinking.

2) When you come up with a brilliant idea to an extent that you think of making love to your own brain/own gender!

3) When your brain is on a roll and you are constantly emitting great ideas.
eg. of 1) “Dude, I am so brainfag-ed!”
eg. of 2) “Man, I am such a brainfag. Look at this piece I have just written!”
eg. of 3) “Look at me brainfag-ing!”
by brainfag January 12, 2016

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