1 definition by WolfBrother13le

Top Definition
A Brainer is when you do something because it had to be done and you knew it was the right thing to do.
1.You gave that guy some of your bone marrow well that's a brainer.
by WolfBrother13le April 24, 2013

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug