Top Definition
A penis that is exactly three inches long (while erect), no longer, no shorter. May also be spelled "3inchmonster" or "IIIinchmonster"
Baby I know I'm a little inadequate for your taste. But me and my threeinchmonster aren't going to waste
by Rahul S. January 14, 2004
2 Words related to Threeinchmonster

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