The study of the elusive micropenis; the natural science concerned with the structure, growth, origin, evolution, distribution, and taxonomy of micro-penises. Someone who studies micropenology is considered a micropenologist.
A: "Did you see that guy's micropenis?"
B: "No, I couldn't- it was just too small!"
A: "Well, if you would have majored in micropenology, you would have been able to"
The kind of involuntary sleep you experience when you're really tired and trying to stay awake in a monotonous situation, like a class lecture. One minute you're propping your head in your hand, trying to pay attention, when all of a sudden you're out -- at least until your elbow slips sideways or your head falls forward, jarring you back to attention. Caused by a consistent lack of sleep over several days. Often the cause of car accidents, when the driver nods off during long hauls.
Man, I had a really bad microsleep during trig yesterday. I couldn't stay awake for more than a minute or two.
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."