Top Definition
The 3 month rule refers to the time period after which a girl can be judged on her looks for real. The problem is that girls often look much fitter when they are first seen, but after 3 months, if they are still regarded as fit, then the must be a fit girl.
"hey, have you seen the new girl? She's so fit man!"
"yeah she is, but remember the 3 month rule. Only time will tell!"
by kitch69750 November 02, 2011

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