Top Definition
Shorted version of the phrase "In on page 1". It is used on internet forums as a form of gamesmanship to signify that a poster managed to post on the first page of a rapidly expanding thread expected to reach multiple pages.
OP: Look everyone! The forum admin got arrested with a hooker and I have pictures!

2nd Poster: No way!

3rd Poster: IOP1

4th Poster: I heard the hooker was a tranny!
by millercommamatt May 25, 2011

The Urban Dictionary Mug

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Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

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