Top definition
Shit that builds up in one's head as a result of daily living and experience.

Mental tartar.
I need some mental-floss, there's just too much shit clogging my head.

Did you let the dog out? Uhh, I don't know.
by s6 July 05, 2005
Mug icon

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