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1.
Playing the marvellous instrument known as the penis by blowing and sucking in various different ways.
-girl: I'm an expert at playing the moth organ
-boy: wow, what's that? Can you show me?
-girl: okay then, drop your pants

-boy: ohhhhh mouth organ, sure 😜
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2.
mouth organ another colorful euphemism for the act of fellatio.(sucking cock)

also known as a harmonica
I preformed on a juicy mouth organ
by utahbear September 03, 2006
8 9