A cat that lives with people who listen to the Beatles so much that when said people is drunk/high, they talk to the cat as if it was John Lennon.
(Weed smoke in the air)
Eric: dudeeeee, my cat is the shitzzzz.
Eric: my cat, dog, (sleeps)
Pablo: wake up!
Pablo: What makes a cat cool?
Eric: It's a Beatle Cat, it's fucking John Lennon
Pablo: You're fuckin' high.