stacking
n.— «We occasionally hear from volunteer ambulance squad members in Parsippany about entering apartments and discovering six, or seven, people living in small quarters. This is commonly called “stacking.” In last June’s primary, Republican mayoral candidate John M. Fox called stacking the biggest issue in town.» —“Illegal Housing” Daily Record (Morris County, N.J.) Oct. 11, 2005. (source: Double-Tongued Dictionary)