Having a girl lick your asshole while giving you a hand job.
"The orchestra of fucking sounded much better with that Rusty Trombone."
by Ryan May 24, 2004

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When a women licks shit out of your ass and jers you off from the other side
While Lana was giving me a rustytrombone I jizzed in her hand and shit in her mouth
by Urban Dictionary March 09, 2005

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A trombone that, when subjected to water or water-based liquids and even air moisture for a long enough time, develops an outer layer of iron oxide most commonly known as rust. It makes a trombone aesthetically and ergonomically unpleasing, as well as difficult to play.
Andy: Hey Bobby, do you want to play my flute?

Bobby: No, I want to play my trombone but it's not working. I dropped it in the water and accidentally left it there for six weeks. Now it is a rusty trombone.

Andy: Well shucks.
by Chigglywiggly February 14, 2010

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when you fuck a girl in the ass and then jizz but keep on fucking her when you pull out your dick it looks like a rusty trombone.
i did a rusty trombone last night
by lkjhhjkl January 02, 2010

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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 03, 2014

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The act of having you're ass licked and getting a handjob at the same time
That girl sure plays a mean rusty trombone
by tisom July 06, 2014

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When your girl licks your asshole while she reaches around and jerks you off. Looks like she's playing the trombone.
I was standing in the shower and my girl gave me a rusty trombone
by Freezerguy December 04, 2013

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When a guy is standing (some times squatting) and his partner gets behind him and gives him a rim job while, at the same time, giving him a hand job through his legs.
My girl played my trombone last night. My Rusty Trombone!
by lollios December 14, 2014

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