MILF Shake Pun

Alright, listen up, you big dummy. This meme is a pun, see? They're taking the term 'MILF' and combining it with 'milkshake' to make 'MILF shake'. It's a play on words, and it's a bit dirty, which is probably why you're giggling, you simpleton. Based on your confused face, I bet you were expecting a recipe, weren't you?