Top Definition
The process of sucking on a girl's rectum and reaching around the front to stimulate with your fingers. Called so because of the term "rusty trombone" and it's similarities to it.
"I gave my girl a rusty violin last night, and she loved it!"
"What's a rusty violin?"
"Well it's like a rusty trombone, but just for the ladies."
by Darth Creampuff October 27, 2013

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