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(n.) Rule of dating etiquette that dictates whether or not you can date a prospective girl/boy without being a kiddy-diddler. It states that if your prospective mate could recite the alphabet by the time you were born, they're too old to pursue a romantic relationship with.

Often seen as a stricter alternative to the half your age plus 7 rule.
Rachel wanted to be Jess's girlfriend, but the ABC rule prevented her from doing so.
by that guy from the supermarket September 19, 2009
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