sack up
v.— «I heard the term “butch up” while watching “Die Hard With a Vengeance” last night.…I have transgressed the term to be more encompassing to be used more like “grow some balls,” “sack up,” “have some integrity” etc.» —“Butch up heard in movie” by Robert Schuh (rschuh@yahoo.com) Usent: misc.fitness.weights May 23, 2000. (source: Double-Tongued Dictionary)