What is "pusheen"

Pusheen is a cartoon cat who is the subject of comic strips and sticker sets on Facebook. Pusheen was created in 2010 by Claire Belton and Andrew Duff for a comic strip on their website, Everyday Cute. The original comic strip series included characters modeled after Belton, Duff, their dog named Carmen, and Pusheen, a chubby gray tabby cat based on Belton's childhood cat. Her name stems from the Irish word puisín, which means kitten.