A milk party is an invite-only shindig in which guests are instructed to arrive with a gallon of milk to be presented to the host. The purpose of the milk is unknown to all guests, and it is generally accepted that the host will reveal his or her intentions for the milk at the height of the party.
by NUMNF October 10, 2015
Code for drinking. Commonly used when a school club wants to hold a party without getting by university officials.
by Damnifiknow November 10, 2010