When a person gives a woman a rim job (anal pleasures with their tongue) and then proceeds to finger her with two fingers, as if that person were trying to whistle with those two fingers.
"You gave him a Rusty Trombone?" "Yeah, but he returned the favor and gave me a Rusty Whistler right after!"
by dclay August 26, 2009
Get the Rusty Whistlermug.