"As a sports metaphor? (“Let’s face it. The Celtics drank the Knicks’ milkshake last night.”) An amorphously obscene
double entendre, hearkening back to its Kelis-ian roots? (“I’d like to
drink your milkshake!”) Or maybe, in a nod to the godlike venom of its utterer, a taunt: “You best back down before I
drink your milkshake, bitch.”
--nymag.com