A cartoon character fat grey-striped tabby with lots of attitude and not a care in the world. Makes Garfield look like a high-strung pansie.
best example was available on a t-shirt in the early '80s and featured Kliban Cat sitting on a barstool playing a guitar and singing these lyrics:
Love to eat them mousies
Mousie's what I love to eat
Bite their little heads off
Nibble on their tiny feet.