A person who purposefully misuses a term or tries to appropriate a term based on historical meanings in order to advance a political agenda.

Terms some etymological terrorists have used in the past:

Isolationist to refer to non-interventionism
Classical libertarian to refer to communism
and more.
Bill Kristol is being an etymological terrorist when he calls people who don't want to always be involved in a war "isolationists" when in fact isolationism is what North Korea has and non-interventionism is what Switzerland has.
by Gunguy February 20, 2016
Get the etymological terrorist mug.