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1.
Similar to the rusty trombone except performed on a woman. While giving her a rim job you reach around and slide your fingers into her sweet spot, thus appearing to be playing a muted trumpet.
by The Jive Turkies March 27, 2003
 
2.
An "inverse" rusty trombone.
I got a Muted Trumpet. It made me go "wah wah wahhhhhhhhhhhhh"
by Ben November 07, 2003