1 definition by KaiTenSatsuma [KTS]
Popularized by the film "The Boondock Saints", The Rule of Wrist is a fitting male translation of the original rule, "Rule of Thumb", which is; a man can beat his wife as long as the stick was no wider than your thumb, after drunken review, it was decided that a stick as wide as your thumb cant lay out proper punishment and the width of your wrist should be used instead. upon mentioning this to a female in a serious tone of voice, expect to be kicked in the testicles.
by KaiTenSatsuma [KTS] April 8, 2007