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!
by SkunkBoi August 22, 2011
10 Words related to Rusty Guitar
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.
by Dykeee April 26, 2006

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