A standing man getting his asshole eaten out by the woman he just ass-fucked, while she jerks him off from behind. The man has to have ass-fucked the woman, hence what makes your trombone "RUSTY"
Tom fucked Kelly's ass so well, she treated him to a Rusty Trombone.
by Mr. Bator July 30, 2008
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When a male is receiving anal stimulation orally, while simultaneously getting a hand-job from aforementioned anal diner.
Kirsten played the Rusty Trombone on Jon all night.
by Daimo42 June 23, 2007
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tossin the salad while yankin the tubesteak smothered in underwear. unless there is some wanted or unwanted gas. then it's reffered to as a rusty gillespie.
during the tromboning, the dressing is made while tossing the salad. with little or no lumps! thanks devin!
by the dil September 28, 2003
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From Wikipedia:

Rusty trombone is a sexual act in which a man stands with his knees and back slightly bent, with feet at least shoulder width apart to expose his anus. The other partner typically kneels behind the man and performs anilingus while reaching up beneath the testicles or around the body to manually administer rapid up and down motions of the penis, mimicking the motions of a trombone player. The act is defined primarily by the physical orientation of the partners and the combination of analingus with manual sexual stimulation; however, other positions and variations are possible.
Haley played my rusty trombone last night.
by Fakename Bill August 02, 2014
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a trombone that was left in the rain
my trombone got rusty because it was left in the rain and rust formed all over the shaft and mouthpiece, thus it was a rusty trombone...indeed.
by John Ritter October 17, 2003
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