Commonly used in the Dutch student world. It refers to someone who must chuck their glass, most commonly beer, in one go. Often used in these sentence;
Trek maar een adt! = Chuck your glass!
Or it's used after a speech whereby the speaker will shout Ad Fundum which means bottoms up. Then the speaker and its listeners will adt their drink.
Will said to Alex; "Take an adt!" (Chuck your glass)
Micheal shouted at the end of his speech; "Ad Fundum!" He and the others chucked their glass of beer in one go.
(Dutch:) Casper zegt tegen Owen; "Zeg gozer, trek maar een adt."
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