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backfire-poop 

Refers to where you are unknowingly expelling a "separated pair" of stumpy poop-logs (rather than just a "standard" one-piece turd of considerable length) with a sizable "gap" of pressurized methane in between them; the result is an explosive whooshy bang partway though the dump that echoes hollowly in the toilet-bowl and is amplified/intensified by said bowl, just like the sounding-board of a drum or stringed instrument.
A backfire-poop can be highly embarrassing for the pooper if others are within earshot at the time. Some guys, however, are actually proud of making these "impressive" anal indiscretions, since it proves that they only produce "manly-sized" turds which "seal in the combustion", with no blow-by from a minuscule-diameter poop-log's allowing the gas to wastefully/splutteringly seep past the emerging turd in a much-less-spectacular noise-display.
backfire-poop by QuacksO September 28, 2018
Related Words

Morning Poop 

Where else is the 12 hours of sewage gonna go?

When you wake up in the morning and you have to take the some of the biggest shits you've ever seen.
"Dang, when I wake up every morning, I feel like I have to shit. I feel obliged to do it every morning, or else my day is just weird."

"It's called a morning poop, Joe. Get it right."
Morning Poop by A price of shit October 20, 2019

No Poop October 

Just like no nut november but you are not allowed to poop in october
are you doing the no poop october challege?

yeah, bro! that shit gon be hard
No Poop October by Zane.D666 November 7, 2019

nina poop 

Nina hall is a poop and stink shit she eats shit and hates black people and cotton fields according to her should “be up and running again”
Hey have you seen Nina poop
nina poop by Poopieeenina February 6, 2020

No Poop August

A challenge where if you participate you can't poop the entire month of august.

PARTICIPATING IN NO POOP AUGUST ISN'T RECCOMENDED.
PARTICIPATING IN NO POOP AUGUST ISN'T RECCOMENDED.
PARTICIPATING IN NO POOP AUGUST ISN'T RECCOMENDED.
Roommate: You haven't been in the bathroom in so long, don't you have to poop?
Participant: No, i'm participating in no poop august, meaning i can't poop for the entire mont of august.
Roommate: Ok then...
No Poop August by emerex56 February 29, 2020

Big Poop 

When someone sits on the toilet to take a normal poop than ends up staying on the toilet pooping for 2 hours
"Jimmy's taking a BIG POOP"