rusty slide-whistle 

Basically the gender reverse of the rusty trombone. That said, details matter. As the gentleman lovingly rims the fair maiden, he rubs his index finger along the moistened edges of her (insert preferred term) for her comfort. Next, slowly insert said finger in the aforementioned, while lovingly whistling the tune of her choice, hence creating a chorus of musical pleasure.

Ah girl, my man played me "patience" on the rusty slide-whistle last night, Guns-n-Roses never sounded of felt so good.

rusty slide-whistle by lavoinha August 26, 2006

Rusty Slide Whistle 

The Rusty Slide whistle begins with a woman furiously blowing into their male counterparts asshole, while simultaneously tugging his johnson. This act replicates the steps required to play the slide whistle, thus warranting the name.

"Yo, last night Justine busted out the rusty slide whistle, we made some sweet music"

Rusty Slide Whistle by Matthew Mcconaughey's peepee November 29, 2019

Rusty slide wistle 

When your licking a chics ass and your fingering her pussy at the same time.

Hay i gave ur girlfriend a rusty slide wistle last night wile you were passed out

Rusty slide wistle by T.R. fuckery July 14, 2017