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1.
Line used by Daniel Day Lewis (Daniel Plainview) in the movie "There will be Blood".

This line is used to insult opposition in the moment of victory or revenge.
"I drink your milkshake!" - This can be used after dumping girl/boyfriend, quiting your job, scoring a winning point or teasing a friend bitterly.

by Nigel Clarke January 24, 2008
 
2.
In the closing scene of There Will Be Blood, Daniel Day-Lewis says this to Paul Dano to show that he has defeated thee.

A line that would not nearly be as memorable if it weren't for its pitch-perfect delivery.
"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
by dilary huff February 04, 2008
 
3.
An EPIC line used by Daniel Day Lewis, playing the character Daniel Plainview, in the movie "There Will Be Blood".

Properly used when one achieves victory or PWNage after taking something of another's when said n00b was unaware of what was going on.
Friend 1: I just found out my wife was sleeping with my brother behind my back...

Friend 2: d00d! He drank your milkshake!

Brother of friend 1: I DRINK YOUR MILKSHAKE! I DRINK IT UP!!
by Wattzor February 23, 2010
 
4.
Used when one person absolutely destroys somebody else on a skill based level. It can be only used when the superiority of one is taken into consideration, and proved to be unreliable.
When playing battleship, and your battleship is sunk, the other player would yell out "I drink your milkshake!"
by Max Verra May 29, 2008