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!