rusty ukulele
Performing anilingus on a woman while fingering her vagina. Similar to a rusty trombone.
That bitch is so hot, I'm gonna give her the rusty ukulele.
Rusty Milkbox Ukulele
The opposite of the Rusty Trombone, in which the recipient is female. Basically, the male (or female) licks the receiving girls asshole while fingering her.
Man, she gave me a Rusty Trombone so I had to return the favor. I spun that bitch around, got down on my knees and gave her a Rusty Milkbox Ukulele.