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 Proposed Canon
First Appearance: IPTSF Text 30
 Real World Reference
A Trombone is a musical instrument. Rusty can refer to skills that atrophy due to lack of use. If Rusty's skills are not put to use, then Rusty's Shockmancy may indeed be very rusty.
A "Rusty Trombone" is a somewhat unhygienic sex act. The fact that Rusty is not held in high regard might be connected.