1. A poorly maintained tambourine. Perhaps because it got dropped in a puddle or left outside or something.
2. Like a rusty trombone, but for people who can't really play an instrument.
"Hey buddy, that's a pretty rusty tambourine."
"Yeah, I guess I dropped it in a puddle or left it outside or something."
"I thought it would be hot if I got a rusty trombone from Janet, but it was sort of like getting an amateur prostate exam and an indian burn at the same time. It's like kids aren't learning anything at band camp nowadays."
"You shouldn't say 'indian burn,' dude. That's not cool."