Drinking spree ( Informal ) (5-2)
(Other definitions for booze-up that I've seen before include "Drinking spree" , "Heavy drinking session" , "Bout of serious drinking" .)
(Other definitions for bender that I've seen before include "one twists" , "Slangy drinking spree - crooked result?" , "makeshift shelter" , "Drunken spree (sl.)" , "What might leave one legless" .)