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1.
Verb; The act of ramming your vehicle into the rear end of another vehicle at a considerable speed.
-"Damn, that guy was going pretty fast when he hit you"

-"Yeah, he muffler fucked me pretty bad"
by Whiskie December 01, 2009
 
2.
A fag who fucks mufflers, usually named jimmy
look at jimmy...that muffler fuck!
by Titts December 04, 2007