POSSLQ
[ pos-uh l-kyoo ]
/ ˈpɒs əlˌkyu /
noun, plural POSSLQs, POSSLQ's.
either of two persons, one of each sex, who share living quarters but are not related by blood, marriage, or adoption: a categorization used by the U.S. Census Bureau.
Origin of POSSLQ
p(erson of the)
o(pposite)
s(ex)
s(haring)
l(iving)
q(uarters)