A very strange and rare sexual act. This is when a Female lick the back buttonhole of a male, whilst reaching around and giving the man pleasure by hand. When viewed from the side it appears as if the women is playing the trombone.

Adj. Something that is expected to have a long lifespan by virtue of having existed for a long time, based on the lindy effect, named for the New York restaurant Lindy's, coined by Albert Goldman and popularized by Nassim Taleb.