When you go down on a chick vigorously shaking your head side to side like a rabid dog
I play the body harmonica like a toothless homeless man would eat corn on the cob.
Two guys docking and a girl goes from cock to cock with her mouth.
Dude your mom gave me and Dave a dirty harmonica
When two biological males stand front to front and skotch tape their dicks together. (As supposedly done by Marilyn Manson and Twiggy Ramirez when they wanted one girl to give them both head.)
"Well, there's two of us and one of her... Let's do that dick harmonica then."
Giving a woman a rimjob, and a reach around. Often involves blowing in the butt cheeks.
I gave your sister a rusty harmonica.
A musical instrument consisting of a number of glasses partially filled with water. The glasses are filled to different levels, hence the production of different notes when the player rubs their rims with a moistened finger. The sound thus produced has a haunting, otherwordly quality. It is most famously called for in the "Mad Scene" from the opera LUCIA DI LAMMERMOOR by Donizetti, although that part is now usually played by a transverse flute.
Opera fan A: What's your favourite recording of LUCIA?
Opera fan b: The one with Beverly Sills, because it uses the original scoring for glass harmonica.
The act of two women performing oral sex on a man, while both women slide their lips up and down parralel sides of the shaft.
That threesome was crazy, jill and leilani went dualing harmonicas on me!
noun
A dick with a much less that average length, but is, similar to a harmonica, extremly wide. Also like a harmonica, it is easily blown.
Jenny: Karol, your dad is weird!
Karol: Hey! No he isn't!
Jenny: He gave me harmonica dick!
Karol:...I think it's good...