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The act of a man licking/eating out a female's asshole while fingering her clit (like a guitar).
Bob: Man, I just don't know how to satisfy my girlfriend lately.
Jeff: Sho, does she like music? Then give her the rusty guitar.
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The act of licking a females anal opening while reaching around and fingering her, resembling the act of playing a guitar. Somewhat like the Rusty Trombone
Non-Bro: Yo bro! I just rusty guitar'd that chick, it was insane!
Other guy: Yo you're sick man!