A party held in a multifloor residence complex at which progressively stronger alcoholic beverages are offered as you ascend to a higher floor. By the time they reach the top floor people have lost the good sense not to drink the toxic swill on the offing up there. The party is usually organised by males in the hope of getting females drunk thereby lowering (or iliminating) their inhibitions
They had a progressive drinking party at her dorm. It was beer on the first floor, wine on the second floor, gin and tonic halfers on the third floor and some kind of leathal punch made with mostly everclear on the top floor.