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Hot Muffler 

When you take a shit that's either huge, or after eating spicy foods, causing your anus to bleed.
That spicy burrito gave me such a hot muffler.
Hot Muffler by Justhefactsmam August 3, 2017

Boston Muffler 

When you're penetrating someone anally and they fart, creating a muffler sound.
Brian "Did you go give it the chick you met at the bar last night"

Tony "Yeah, I gave it to her from behind. She even gave me a Boston Muffler. The vibration was amazing"
Boston Muffler by ItsPseudo October 5, 2017

Nugget muffler 

When the booty hole too big for ya nugget
"Yo john she got a nugget muffler"

Cock Muffler 

The simulation of making cars sounds while performing oral sex on your partner.
This cock muffler sounded like a V8 shelby mustang.
Cock Muffler by Recome June 7, 2018

FLUFF MUFFLER 

A DISMALLY LUBED "CONTACT PATCH" THAT A GUYS NAIL CANNOT PENETRATE DUE TO BEING DENIED ENTRY BY THE HAG/IT -
NO SQUEEKY CREAKY GOINGS ON TONIGHT COZ MY BABES GONE WITH FLUFF MUFFLER -
FLUFF MUFFLER by NAIL BANGER June 7, 2018

cooch muffler 

"I'll grow the best cooch muffler you've ever seen"