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An incredibly small cock.
Jane took one look at Jack's millimeter peter, and ran like hell.
by Tails September 16, 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 14, 2013
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some one with a super small dick that the ladys dont wanna see or cant see.
Ray Disaster has a super small millimeter peter so he dont have sex witht ladys due to smallness
by johnnybesupersmalllawl February 24, 2008
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a penis thats only a millimeter(smallest unit in the metric system) long. insult used by canadians
look at that millimeterpeter if you needed to give that guy a blowjob you would need a magnifying glass and a straw
by the_wizard May 27, 2006
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1. A man whose wiener is so small it is virtually non-existant

2. An insult exaggerating the size of one's penis as only a few millimeters or less.

3. A penis that is only one millimeter long, far outclassing the one inch wonder in small stature.
"It was unclear if he had an erection as his millimeter peter was too small to extend his pants"
by KX12 May 20, 2014
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