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!!!
When you've been harboring a major cable so long that your body starts to forcibly reject it, giving you the feelings of contractions in your anus. Often accompanied by ass sweat, and anal convulsions.
Man I've been holding off on dropping this bad boy off so long, I'm starting to have poop contractions!
The clause by which a female may circumvent the moral law which dictates that a female should not engage in sexual relations prior to marriage by participating in anal sexual relations in lieu of vaginal intercourse. Additionally, the female will conveniently avoid risk of pregnancy while simultaneously preserving her virginity.
He: No, we cannot have sex, we are not married!
She: It's okay...we can use the poop hole loop hole and you can do me in the butt!
He: Sweet!