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.
by king dude January 24, 2005
by Matt January 09, 2004
Used as a code word over the phone when talking about marijuana cigarettes, joints, reefers, doobies, chongers, etc., etc....
by stoner July 17, 2002
Did you see Stevie Wonder at the Democratic National Convention? He totally gave someone a Rusty Muffler.
by Kenny Young August 28, 2008