What is Rusty Mouth Harp?
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Its when you perform a rusty trombone on a girl. Except its more like a mouth harp
Its like dueling banjos, but without the dueling or the banjos and with a mouth harp and an asshole thus making it a rusty mouth harp
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When you're giving it to a chick from behind at the top of a long flight of stairs (make sure there are a lot of steps). You donke..