Grumpy Cat Products Internet Sensation’s Most lovable cat, The Grumpy Cat Gift Products! Tardar Sauce (born April 4, 2012),] better known by her Internet name “Grumpy Cat“, is a cat and Internet celebrity known for her grumpy facial expression. Her owner, Tabatha Bundesen, says that her permanently grumpy-looking face is due to an underbite and [See Full Page]