rusty+trombone 

Masturbation while recieving anilingus. The reach around being the trombone.

A Rusty Trombone, is while having his ass ate out his partner gives him a reach around and masturbates him. He has never had a rusty+trombone done to him.

rusty+trombone by Brndmg July 16, 2006

Rustytrombone 

When a women licks shit out of your ass and jers you off from the other side

While Lana was giving me a rustytrombone I jizzed in her hand and shit in her mouth

Rustytrombone by Urban Dictionary March 9, 2005