A standing man getting his asshole eaten out by the woman he just ass-fucked, while she jerks him off from behind. The man has to have ass-fucked the woman, hence what makes your trombone "RUSTY"
Tom fucked Kelly's ass so well, she treated him to a Rusty Trombone.
by Mr. Bator July 30, 2008
The act of performing anal cunnilingus while reaching up above the testicles to manually administer quick up and down motions to the penile shaft; resulting in a violent yet pleasant explosion. It is then customary for the female to then give a quick blow into the anus for good luck, the lips blowing into the anus sounds very similar to a trombones sweet melody. This was introduced to the Americas in the late 50's.
by JAZ October 14, 2004