Lickitung and Squirtle

Alright, listen up, buttercup. This joke is using the names of two Pokémon, Lickitung and Squirtle, and twisting them into a sexual innuendo. Lickitung's name sounds like "lickin' tongue," and Squirtle's name is being used to suggest... well, you get the idea. You probably didn't get the joke in the first place because you are a total loser and probably are still watching Pokémon and also have never experienced a real relationship.