rusty violin 

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."

rusty violin by Darth Creampuff October 30, 2013

Rusty Violin 

Tongue jacking her shit box whilst fingering her clit.

I was giving Becky the old rusty violin when her mom walked in and ruined it.

Rusty Violin by Pineapple trombone March 6, 2018