A sock that is your little brother thought had salty milk in it but was really your cum sock. Often a white sock with red stripes.
"That was a good milk sock big bro." "That wasn't milk..."
by Milk sock November 25, 2019
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Douse an old sock in milk. Toss the sock under an enemy's couch and sooner or later it will stank up their house.

To be used for a prank.
Tommy is such a prick, I'm gonna get him with a milk sock.
by out in the field November 7, 2005
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Tom picked up the wrong sock and sock milk leaked out
by AOletsgo October 8, 2020
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