Top Definition
(v) When two members of an internet forum post identical or very similiar responses to a thread in very rapid succession. The poster whose response appears first is the fasposter, and the poster whose response appears second has been fastposted.

The fastposter is then entitled to mock whom he or she fastposted by pointing out the fastpost.
poster 1: Ms. Debbie is so fat
poster 2: Boy, that Ms. Debbie sure is fat
poster 1: Fastposted!!!
poster 2: I'm so ashamed.
by Boxcutta September 22, 2006

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