An instrument played by using the toilet when all you have to give it is the air from your ass in different strengths to create a combination of high and low pitched notes.
After a long night of eating chimichangas, I had the pleasure of playing the porcelain harmonica and was able to play a version of Beethoven’s “Symphony No. 6” with the beautiful instrument.
by colintaylorful October 20, 2017
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Performing oral sex to a woman
Guy: oh my god I wanna give you a harmonica so bad

Girl: ooooh yeah I can’t wait
by Dyl-Dyl December 29, 2021
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The act of fellatio, performed by two mouths on the same penis.
The best head I ever got was from Carrie and Blair. Those two were playing the Devil's harmonica!
by LockguyDFW November 24, 2020
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An imaginary instrument played by the person or persons being insulted.

The instrument is mimed and the insultee makes a sound along the lines of 'wububullyuuu'
'nice outfit mate, you look like a banker'

'BURN HARMONICA'

*mime the harmonica"
by RstarMenergy February 21, 2009
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The stratigic placement of a musical instrument in your girls mouth, whilst plowing her from the back.

When she's screaming like a boar, gently place the Harmonica in her mouth to complete the Hillbilly Harmonica.
What did you do last night mate.

" well we had good night until I have her the Hillbilly Harmonica"

Its where you put a Harmonica in your partners mouth while she's being plugged from the back.

She's want pleases but it definitely made a fucking symphony.
by porkchopp69 November 9, 2020
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When two men are docking (uncircumcised man wraps his foreskin around a circumcised man) and another uncircumcised man comes up and wraps his foreskin around both of the guys that are docking and sways back-and-forth side to side left to right.
Cody docked Elijah and Jake harmonicaed the two of them.

“Hey Jake, I just docked Elijah... you wanna come play the harmonica?” -Cody
by ThreatLvlMidnight February 7, 2021
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