Short form of Harlot Monica or Whore Monica (disputed), an affectionate term coined by the 42nd president, President Clinton.
"Willie!" said the first lady. "Are you going to play with your harmonica again?"
by Ben Clintonized February 12, 2004
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When a woman (or man) moves both of her(his) lips along the length of the shaft of a man's penis, simulating the playing of a harmonica.
Before she sucked my cock, she gave me a killer harmonica!
by bjmike January 14, 2010
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When a person eats pussy by having his/her head sideways in between both of the woman's thighs on his/her head and chin, and succeeds in making her so excited that she moans in notation just like a harmonica.
"I didn't have to turn on the radio, i just played the harmonica in my girl's panties"
by TooSmooth March 25, 2012
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When a young lady gives a line-up of men rapid blowjobs by running her mouth along the penis heads as if they were a harmonica.
"Dang, that ho gave us a harmonica last night..."
by Antoine December 14, 2004
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A harmonica is an instrument made for the use of those who go to oxford university and think it is cool.

by HackRheTon January 16, 2012
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When two homosexuals are docking, and create a leclair- then a third homosexual places his mouth on the leclair and quickly moves it back and forth while blowing. This makes the leclair look like a it is a harmonica being played by a crazy man- complete with semen flying everywhere.
Mike liked Ryan and Sam's leclair so much, that he decided to make it a harmonica. Just like when he volunteered at the old folks home, thanking the elderlies.
by nonbeliever March 21, 2006
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