Grumpy Cat is a female cat named Tardar Sauce (“Tard” for short) who was born in 2012. She has a permanently gumpy look on her face due to a medical conditional called feline dwarfism that causes her to have an under bite. Grumpy Cat became an internet sensation when her photo went viral, a common caption to add over her picture was the word “NO!”. For a grumpy cat costume you will need brown and white face paint that makes your mouth looked turned down at the corners. You will also need furry brown cat ears on a headband and a sign or t-shirt that says "NO!" or "I Hate You!".