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The feeling of slight soreness/dull aching pain following the act of immense bowel cleansing, coming from the anus expanding to a, sometimes, seemingly unbelievable amount.
Bobby: Are you okay, Chuck?
Chuck: Oh, I'm alright, I'm just experiencing some pretty horrendous poop aftershock.
Bobby: I told you not to have that fourth bean chalupa last night!

Sometimes I can barely walk after I take a huge POO! DAMN YOU, POOP AFTERSHOCK!!!
by Ashley and Abby February 09, 2008
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