Top Definition
One who backs and/or petitions a law or idea that seems crazy, ignorant, dumb, or socially unfitting or unacceptable for the times (these words/situations often defines the term "whack" or 'whack-o").
That chump must be a whacktivist for supporting the anti-same sex marriage bill - isn't love universal?
by T.M. Setsuna July 10, 2012

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