look up any word, like cunt:
 
1.
A person of any sex who enjoys deep throating.
Danielle is such a cock muffler she took that dick all the way..... Balls deep
by wknd1warrior February 16, 2009
 
2.
Whore. Someone who has so much cock in their mouth that they can be considered a muffler for it. Does not necessarily imply swallowing. See also cum muffler.
That girl is a regular cockmuffler!
by Bob McFillius April 09, 2003