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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 vengeful act of crapping on a lover's chest while they sleep.

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65
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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66
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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67
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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The vengeful act of crapping on a lover's chest while they sleep.

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68
When a someone or something is engaged so furiously in a sexual act that it is being thrust back and forth like the slide mechanism of a trombone. The rusty part of the word is from the person or objected being covered in some kind of bodily fluid.
I fucked that amazon drone so hard I gave it a rusty trombone.
by ShadowChix March 08, 2017
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