What the heck is a "milkshake"?

You know, as in that catchy radio song that goes, My milkshake brings all the boys to the yard, and they're like "It's better than yours." Damn right, it's better than yours...

Look no further than urbandictionary.com, an excellent source for the latest street lingo.

Milkshake n.
--whatever a female can do to attract a man, as in "like I showed my man my milkshake."
--[put another way,] the things you do/say, the way you move, or the way you act, to attract a man (and it says see also "mojo").

Aaaahhh, I am now sufficiently enlightened. Next week: Dubs.