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.

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.