Definitions include: "Milkshake is just that thing that makes a woman stand out from everyone else. It's a thing that makes you sensual and warm and maternal. It could be about breasts but I don't have huge tits so you gotta work with what you got." - Kelis
Definitions include: statement of agreement used when someone corrects one of your prior statements, and their correction was unnecessary because you are aware of that, and either the other person misunderstood you or you didn't phrase it well.