A Karen is a kind of person who is unhappy when little things don’t go their way. They are a, “Can I speak to your manager?” kind of gal. The bitchy soccer mom of her friend group that nobody likes.
“Do you see her over there? She’s such a Karen.”
“Hi! You put meat on my son’s turkey sandwich, when he is STRICTLY VEGETARIAN. If you know what’s good for you, you’ll direct your manager over to me right away.”