A sacred vow more powerful then a pinky promise. If it is a girl who broke said thumb promise she is intitled to 40 hours of oral sex upon the person who had the promise brokded. If its between two guys you must chop off either of your nuts for punishment.
dont break thumb promises
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