mouth harp 

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'

mouth harp by mr.millar January 13, 2008

Rusty Mouth harp 

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

Rusty Mouth harp by woonage December 19, 2008