Top definition
A person who is a result of one having a thumb up their ass.
Having 'a thumb up your ass' is lazy but the ass thumb is so lazy that their not even doing anything.
Bob didn't do anything the whole week, what an ass thumb.
by Tom Ladonne September 14, 2006
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