noun.

A penis whose primary characteristics are defined by it's inability to reflect any perceptible amounts of light towards a human eye due to its extremely diminished stature. Thus being only perceptible by mechanically or computer aided viewing devices such as a microscope.
Micropeens are so small they make me laugh.

I can't see your micropeen.

Apparently a micropeen was on my leg, but I could not feel it.
by G-Noles March 10, 2010
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You have a micropeen.
by jenk February 24, 2005
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The very rare category of man or woman who prefers or who is sexually attracted to very small penises, in other words the complete opposite of a typical size queen.
Darrell: "Well, Kelly broke up with me. I guess it was just a matter of time..."
Kenny: "That sucks dude. Was it because of your unusually tiny penis again?"
Darrell: "Yeah, that's like the eighth time this has happened to me. But I am holding out hope that somewhere out their lies my micropeen queen."
Kenny: "Good luck man."
by StonerWithATinyBoner February 1, 2015
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