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1.
Prior to taking a dump, you get horrible pains in your stomach. Those pains sometimes get so bad that you just want to lay on the ground and get into the fetal position.

Pregnant women get contractions and they must hurt a shit load and so do shit contractions.
Duder 1: Dude, hurry up in that bathroom, I have to take a dump!
Duder 2: Hold on, I'm only brushing my teeth.
Duder 1: I'm having shit contractions, please hurry up!
by FoulMe January 03, 2012