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A period of intense focus when creating decks for collectible card games such as Magic: The Gathering. Often stretching into the twilight hours of the night and replacing actual playing time altogether.
Mark: "hey you wanna play some MTG tonight?"

Phil: "Yea sure. I had some major decksex last night, need to playtest some new cards"
by MrCopacetic June 08, 2014
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