A medical term for a penis under 2.7 inches in length. Also known as Tiny Petito.
Before crossing the threshold Bob paused, riddled with sickening guilt; "what about my micropenis??" he asked himself. What about the micropenis indeed. Bob concluded to forget about his tiny petito for once.
by Zee November 5, 2004
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One who has a small or, Micro Penis.

Often used to confuse others and let them think about it
by Scythesweep December 4, 2015
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Person 1: bro, susan micropenis headass is gross as fuck.

Person 2: who is susan micropenis?

Person 1: that canadian dude, shawn mendes.

Person 2: oh yeah! i totally agree.
by SomebodyWhoIsANobody March 7, 2021
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The process of the penis shrinking when it becomes cold
Cooper has a micropenis
by heyo stee December 7, 2007
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An overly loud vehicle that is purposely so. To make up for the drivers micropenis. The louder the vertical the smaller the penis.
Damn, that micropenis muffler is so loud, dude must be hung like a bee!
by Novellium April 30, 2021
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