A person who likes to complain about little stuff, essentially turning an easily solvable issue into a big problem. Blowing things way out of proportion.
Karen orders a sandwich and requests two slices of tomato. Her sandwich only has one slice when she recieved her order. Karen demands to speak to the manager.
K: My order is wrong.
M: Understood ma'am, but what seems to be the issue and can I see the reciept?
K: I asked for two slices of tomato. I only got one. Either I get a new sandwich or I want my refund.
M: Ma'am we can add the other tomato to your order free of charge.
K: I wanted my order correct the first time, no I want a new sandwich and my refund.
M: Sorry ma'am but that hardly warrants a refund.
K: I'm emailing corporate and I'm writing you a horrible review for negligence. *K storms out*
M: What a Bitch Nugget.