A penis that hasn't been used in a long while.
That old man probably hasn't used his rusty key in years!
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Act of fornication that occurs prior to giving a Rusty Trombone. One uses a finger or 2 in order to loosen or open up a anus that is locked tight.
Asservir didn't know what a Rusty Basement Key was and had been doing Rusty Trombones wrong for years.