Muffler lips 

The result of smoking rocks and incurring 1st, 2nd, and/or 3rd degree burns on your lips; as if they've been placed on a hot muffler.

Crackhead Sally got muffler lips.

Muffler lips by WithaZ December 24, 2018

Muffler Belt 

Along the lines of Blinker Fluid, it is used to confuse people who know very little about cars. This belt does not exist, as it would be unnecessary to the exhaust system.

John, "My car started sounding funny on the drive over."
Dave, "Did you remember to tighten the muffler belt within the last 3000 miles?"

Muffler Belt by McMoooby March 31, 2006

muffler burn 

A hickey

Wow dude, what were you thinking when you let that chick give you that big ol' muffler burn. It looks nasty haha.

muffler burn by o ReVelatioN o February 28, 2009

Muffler Man 

A barber who will trim a girl's muff.

The muffler man helped trim my girlfriend's large muff.

Muffler Man by СукаБлять June 6, 2015

Muffler Puppy 

refers to a device used to negate the smell of smoke while smoking inside. This could be dryer sheets, a sock, your friends sweatshirt or an empty waterbottle.

Hey! Im about to explode pass me the Muffler Puppy.

Muffler Puppy by SLATE18 May 9, 2011

Muffler Flap 

When your inside a chick and your ball sack covers her butt hole as she farts, causing your ball sack to vibrate acting like a muffler flap.

I hate when my wife uses my ball sack as a muffler flap!

Muffler Flap by BHS Master September 9, 2019

Muffler Bearings 

Contrary to popular belief, muffler bearings do exist, just ask your local dodge stealth or mitsubisi gt3000 owner. Although a popular prank to pull on the not so automotive savy muffler bearings are located inside the muffler, in order to operate a flap which opens and closes depending on the exhaust flow directing flow back into the turbo. Due to inconvienience (carbon/other buildup often jammed the bearings causing noise and poor performance) the bearings are only found on older models.

Hey go into the garage and grab the blinker fluid and spare muffler bearings!

Muffler Bearings by carCHICKknows April 4, 2009