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.
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

The Rusted Trombone: When a man receives a rim job and a reach around (aka a handjob where the recipient, is in the front) at the same time and then proceeds to rip ass while getting the rimmy reach around combo.
Rusted Trombone Player, "There are 3 reasons why I like to play rusted trombones, the feel, the taste, and the smell."
Shane loved to have Carissa play his rusty trombone.
Shane loved to have Carissa play his rusty trombone.
by The Muffin Man May 7, 2004

by comal6669 October 19, 2003

Lacey was sucking Rick's dick so well, she ended up blowing a trombone when he farted... She had a standing ovation.
by EZvibes December 4, 2019

by ChinchillaWarrior January 5, 2016

by O'lee May 20, 2010

by Neeky Gerd February 18, 2015
