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Mathematical calculation to determine the time a female got knocked up. Most often used to narrow down possible biological fathers of the baby. (date expecting- 9).
Guy 1 and Guy 2 chatting:

Guy 1: "Hey, did you hear Jullie is gonna have a baby in March?"

Guy 2: (inwardly calculates pregnancy math.....)

Guy 2: "Naw, I didnt know that. But that ought to narrow down the possible dads to about a dozen guys she was with last July"
by Mathguy July 05, 2012
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