1. The act of fucking ones anus while the other shits, making a brown squishy substance which both partners eat afterwards.

2. Eating ones shit then spitting it back into their anus then proceeding to fuck until you cum into the mixture.
"Edwin, Dean and I just did a backdoor meatpie"
"How was it?"
"Taste like shit!"
by Two Legged Twat Monkey September 19, 2016
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The act of introducing Irish Whisky into the rectum & colon via the anus (Butt-Chugging)
“Do you wanna go back to my apartment and have an Irish Backdoor?”

“Do you guys know how to get to Ireland from here? Sure, take your pants off and I’ll give you The Irish Backdoor”
by FuccTheNiners March 9, 2020
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