Top Definition
The people who register on messages boards, post one time, then disappear, never to be seen again.

The post that they post is usually a nonsensical one that only a select few might understand, but normally leaving much to the imagination.

A One Post Wonder may contain anything from smileys, the word "Hi", to the more common spam.
One Post Wonder: Hi! :D

*Leaves*

Member 1: What was that about?

Member 2: I've got no idea.
by Da Milkman November 14, 2009

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Lotsa space for your liquids.

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