rusty muffler 

Feces left around the anus. The situation one finds oneself in when, having defecated, one finds that there is no toilet paper available.

I had a crap this morning, but there wasn't any bumwad, so I had to go all day with a rusty muffler.

rusty muffler by king dude January 24, 2005

Rusty Muffler 

Giving a rim job to some one that still has shit on their ass.

Did you see Stevie Wonder at the Democratic National Convention? He totally gave someone a Rusty Muffler.

Rusty Muffler by Kenny Young October 29, 2009

rusty muffler 

what my dad says after fucking my mom in the ass

damn kid, your mom sure does have a rusty muffler

rusty muffler by Matt January 9, 2004

rusty muffler 

Used as a code word over the phone when talking about marijuana cigarettes, joints, reefers, doobies, chongers, etc., etc....

Hey man do you got any rusty mufflers?

rusty muffler by stoner July 17, 2002

Rusty muffler 

When you’re doing anal and the person receiving lets out a big fart around your dick

I was banging this chick in the ass last night and she had bad gas. Gave her the ole rusty muffler

Rusty muffler by Bodacioustatas69 January 21, 2022