Giving a blow job along the side of the penis using the same motion that a harmonica is played.
Blowing the harmonica can be messy.

Can you blow my harmonica?
by vixicox June 12, 2009
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Basically Harmonica sex is where the girl (or guy) typically a bottom is handed a harmonica, they keep it in their mouth the whole time so that any sex noise is translated into a harmonica noise.
Yo, me and Sarah just tried Harmonica Sex, it’s quite a funny experience.
by TonyBaloney721 November 4, 2020
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what kind of sad weirdo looks this up for fun. by the way itis a musical instrument.
by gandal June 9, 2003
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He asked me if I play any instruments...I said yes I play the skin flute, but only if i'm accompanied by the skin harmonica!
by wellygrrl January 22, 2007
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1) A long, smooth instrument made of meat.
2) A penis.
1) He played a vigorous tune on his meat harmonica.
2) "What am I going to do with two harmonicas?" / "Go skiing."
by Michael February 2, 2004
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When you actively blow air up the anus of your female partner, with the expectation of inhaling it back out of their ass while you rub her clit from behind for teh lulz.
Jenny wanted to try something kinky and new, so I surprised her with a Rusty Harmonica.
by Bologna_Skins August 26, 2010
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A woman's cooter, especially one involved in oral sex
This girl totally let me play her fish harmonica after one date.
by Lumpy Stiltskin September 16, 2015
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