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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
by Hello kitty 69 May 08, 2008
12 4

Words related to Thumb Promise:

anal balls oral promise thumb