Karen is a fictional character who causes controversy about everything such as "vaCcInES cAuSe aUtism" and "ViDeO gAmeS cAusE viOlenCE." Unlike the Karen we all know and love, (from spongebob) she gives a fit about everything and is just annoying.
Dude: OMG Karen made another rumor.
Dude2: Yeah man I thought we proved her wrong on vaccines causing autism. Now she is targetting Video Games?!
Dude: Yeah what a stupid rumor.
Dude2: Actually I just played a game of Candy Crush and I kinda wanna kill someone.
Dude: lol
An old woman at her mids 30's with two kids. One 2 years old the other one like 5-7 years old but, both are the devil's children. Karen only wants free things and thinks she's entitled to everything, even you! She wants to speak to the manager the moment she enters a store. She is a Facebook mom, usually supporting the anti-vax community and getting lame minion memes out of there.
The part about that she thinks that she's entitled to you is actually real and can end up in sexual harassment if you have to see a Karen.