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1. An excessive or obnoxious use of hashtags, esp. when used outside of Twitter; i.e. facebook, tee shirts, jerseys, etc.

2. An exemplary description of Marc Pavlofsky's facebook etiquette. (see also: pompous, snide, antagonistic)
Did you see Marc's status? He's so hashtacky.
by Marc's Maker April 24, 2011
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