I just assumed the joke was that she's a femboy.The character shown is Alf, from the 80's sitcom of the same name. He is an alien that is known for eating cats. Pussy is a potential slang term for a cat. Alf literally eats cats, hence "eating pussy." The joke is that Alf would not be eating a cat but would be figuratively "eating pussy," which is slang for providing oral sex to females.