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1.A person of cowardly actions and deed. Usually lazy and unwilling to take action.

2.A pussy
1.Hah, Those europeans can be so cowardly sometimes, bunch of Milk-drinkers.

2. Heh, Those hippies are nothing but a whole bunch of cockholstering, bootlicking Milk-drinkers.
by 047loeonos May 25, 2012
An insult / derogative term deriving from the video game Skyrim, often used by City Guards to suggest a person is weak and / or young / inexperienced.

Possible explanations:
Young babies drink milk from their mother's breasts.
and / or
Those who can't handle mead or ale instead drink milk.
and / or
Milk in Skyrim will restore a Warrior's resource for hard-hitting sword swings. Those who require Milk for this purpose would likely be lower-level, and inexperienced.
Don't be such a milk drinker.
by Dovahkiin & M'aiq the Liar December 22, 2011
A baby, used as an insult. The insult seems to pre-date Skyrim, and may have origins in Scottish culture.
An old Scottish saying is:

"Bread and cheese is gude to eat when folk can get nae ither meat.
Bread and milk is bairns' meat: I wish them sorrow that be it."

Seems to refer to a "milk drinker".

Another Example: "What do you think of that, Mr. Pajama-Wearing, Basket-Face, Slipper-Wielding, Clype-Dreep-Bachle, Gether-Uping-Blate-Maw, Bleathering, Gomeril, Jessie, Oaf-Looking, Scooner, Nyaff, Plookie, Shan, Milk-Drinking, Soy-Faced Shilpit, Mim-Moothed, Sniveling, Worm-Eyed, Hotten-Blaugh, Vile-Stoochie, Cally-Breek-Tattie?"
by Pajama-Wearing Basket-Face January 09, 2013
A weak or spineless person. The implication is that milk is a drink for children, whereas real men drink booze. Popularized by the Bethesda game Skyrim.
You really think you're a match for me, milk-drinker?
by Psycho Robot February 24, 2012
A person who prescribes to chumpish behavior. Favorite activities include being vanilla, adding little value, thinking they add a lot of value. Love chivalry and being "just one of the guys" in the worst kind of way.
Check that kid sucking down 2%, classic milk drinker.
by nnkwfwef May 22, 2014