when a man giving oral licks the womans vagina like a harp, friskly licking the loose outter lips; giving the woman exotic orgasam one after another.
' man tonight im gunna eat my girlfriend out tonight, give her the good old 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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