rusty melodica 

Anilingus performed on female, accompanied by manual clitoral stimulation.

My secret girlfriend likes rimming and fingers, so I think a rusty melodica will be right down her alley.

rusty melodica by Cookies and Unicorns July 27, 2011

Rusty melodica 

Giving a rimjob while simultaneously fingering a girl.
The female version of the rusty trombone

"I heard that shes into some freaky shit, so I gave her the rusty melodica"

Rusty melodica by AVelociraptor November 15, 2018

Rusty Melodica 

The equivalent of the rusty trombone when performed on a female. Consists of orally stimulating the asshole while manually stimulating the pussy, mimicking the actions of playing the melodies.

Jeff: What’s the best way to eat a woman out?
Greg: Give her the ol’ rusty melodica, man, bitches love that shit.

Rusty Melodica by Tayus Neb October 26, 2019