A nickname for a really nice man I know, also a unit of measure.
have you seen millimeter? he seems to be living up to his name lately.
by arousing February 26, 2017
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An incredibly small cock.
Jane took one look at Jack's millimeter peter, and ran like hell.
by Tails September 17, 2003
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The shriveled form a person's pecker (a penis) takes after taking a quick dip in a cold body of water like a freshwater lake or after taking an ice bath. The penis, to a man's horror, retreats in size to almost the point where it is unrecognizable (worst case scenario a raisin). The effects of a millimeter peter can range from a mild decrease in self confidence to extreme panic.
*Two runners after getting out of an ice bath*
Robbie: "Jesus Christos that was cold! I cant feel anything!"
Gabe: "Dude I know! Hollup I gotta do a damage control check. Hopefully everything is ok down there..:

*Gabe looks down in his drawers*
Gabe" "My God!"
Robbie: "What is it bro!?"
Gabe: "I got a millimeter peter...There goes my dream of becoming the next Ron Jeremy..."
Robbie: "Well shit man..."
by A_Real_GEE December 15, 2013
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Everyone has a millimeter monster until puberty.

I heard that guy got dumped because of his millimeter monster.
by JAC7272 April 29, 2014
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Hung like a poodle. A man with a tiny penis.
Hey Van Millimeter, water's cold today, ey buddy?

Tina said Dave's got a serious Van Millimeter crank. He was banging her for a half-hour before she even noticed.

by Rick aka Flames November 30, 2007
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A VERY small itty bitty penis, typically attached to the body of irritating men named Ethan, Ethans are the DEFINITION of tiny dick, and will most likely NEVER please a Women sexually… because of his VERY SMALL PENIS!
Brad: Wow, what the Hell is that between Ethans legs it looks as if a rat and and anteater had a child that died at the young age of 4 months

Jimathy: I think that’s supposed to be a penis?


Jimathy: Yah when it’s that small people call it a Millimeter Defeater, poor Ethan, he will NEVER be able to please a bitch in bed. :(
by my name is my name duh. November 22, 2021
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The little bit of milk (or any other liquid) you leave in the container so you are not responsible to throw out the container.
Tom: Hey Jim, why didn't you throw out this milk jug
Jim: It still has some millimeter milk in it
by Mister Doctor Zeus February 10, 2019
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