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 a female or male(in homosexual scenarios) grabs their partner's penis from behind and plants their tongue and lips on their asshole. Then he or she proceeds by licking and possibly eating out their partner's asshole. At the same time, he or she gives them a handjob. This movement that is performed is very much similar to playing a trombone.
Dude, last night I walked in on Sheeneequa while she was giving Dennis a rusty trombone.

My Boss frequently asks his employees to give him a rusty trombone.

Garrett could not resist asking for a rusty trombone after coming back from band camp.

Stewart: Hey Martha. I Think we should try something new today.
Bertha: Like what?
Stewart: Give me a rusty trombone! Now!
Bertha: But Stewart, you have so much hair all around your ass and on your gooch, it will be like eating a hay bale. Consider shaving that monkey ass of yours and then I will give you the best rusty trombone!
Stewart: Okay, I will do as you say. I may be whipped, but I'm so horny right now.
by bigmelon June 17, 2008
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When a man inserts his penis into a woman's anus and then the woman performs fellatio on the penis.

by colon cleaner May 16, 2006
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its the top shelf at the oriental massage parlor. after a hearty massage she starts to play with your bung with her tongue. Then you rise up on all fours and she starts playing with your unit like its a trombone. Her face will then look rusty, hence the name. Its one of the common techniques taught in massage school.
Tyler won a couple grand in vegas and all he could think about was spending it at the massage parlor for a rusty trombone.
by marcuswelbywrites June 27, 2007
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When a girl or gay male is eating out a guy's asshole while giving him a hand job from the back.This resembles the act of playing a trombone with a rusty mouth piece.
"Yo that dirty hoe gave me a rusty trombone last night."
"You ever give a rusty trombone before?"
by ballin905 April 7, 2006
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When a female or male(in homosexual scenarios) grabs their partner's penis from behind and plants their tongue and lips on their asshole. Then he or she proceeds by licking and possibly eating out their partner's asshole. At the same time, he or she gives them a handjob. This movement that is performed is very much similar to playing a trombone.
Dude, last night I walked in on Sheeneequa while she was giving Dennis a rusty trombone.

My Boss frequently asks his employees to give him a rusty trombone.

Garrett could not resist asking for a rusty trombone after coming back from band camp.

Stewart: Hey Martha. I Think we should try something new today.
Martha: Like what?
Stewart: Give me a rusty trombone! Now!
Martha: But Stewart, you have so much hair all around your ass and on your gooch, it will be like eating a hay bale. Consider shaving that monkey ass of yours and then I will give you the best rusty trombone!
Stewart: Okay, I will do as you say. I may be whipped, but I'm so horny right now.
by superpooper June 17, 2008
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when a girl is jacking you off and licking your browneye at the same time
waaa waaaa waaaaaaa
by comal6669 October 19, 2003
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