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An extended hangout session involving good friends, fellowship, presumably food, and usually some sort of group activity(ies). Merrythons most often seem to take place during the nighttime hours.
Individual 1: Hey, wanna hang tonight? Are you down for some shennanigans?

Individual 2: Fo sho mah gangsta! I got a feelin' that a complete merrython is about to go down.
by TheFighterAce September 23, 2010