A name given to someone who has gone past the limit of what has been asked/hasn't been asked for. This name is given to someone particularly horrendous who spreads awareness to animal rights and support for the environment of mythical creatures. A "Kathy Hag" could also be someone who constantly speaks with profanity and explicit languages around minors.
Friend 1: Hey did you hear about what happened to that girl?
Friend 2: I did, she got suspended for making fun of mom.
Friend 1: o-m-g... what a Kathy Hag...
by mathy4evrevr July 12, 2017
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