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 16, 2008

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giving a girl anal and her anus starts bleeding while you're queefing
i had to wash myself after giving her a rusty trombone
by pft jordan July 22, 2006

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When engaged in anal sex you take your dick out and it has shit on it. Your partner then starts to suck your dick and makes you say something due to pleasure.
She just didn't suck my dick she gave me a rusty trombone.
by spazzy690 March 07, 2011

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Damn! I had to read 53 WRONG definitions of the RUSTY TROMBONE! It has nothing to do with gay dudes, reach arounds, or assholes. It's when you fuck a chick ON HER PERIOD, then she immediatly blows you. Blood has a distinct taste that can well be described as...rusty.
Guy#1: Yeah, so did you hear Blake was dating that weird, goth, "Twilight" chick?
Guy#2: Hey, I bet he gets the old rusty trombone no sweat.

red wings
by dawnpatrol January 28, 2011

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