Top Definition
Analagous to the "rusty trombone", the rusty banjo involves administering analingus to a female while reaching around and strumming her clit/pussy... thus effectively playing the "banjo" with her genitals.

The term rusty generally refers to the "rusty" coloured anus area.
Man, last night I was over Kelly's place and I gave her a rusty banjo!! She went CRAZY while I was flicking her clit and busting out a massive banjo masterpiece with my fingers whilst licking her gorgeous asshole!! :D
by Ross K February 21, 2008
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