Definition of "rankout"

rankout

noun
plural rankouts
1. (slang) Synonym of snap (“an insult of the kind used in the African-American verbal game of the dozens”)
  Quotations
  The subcategory of snaps or rankouts often follows the formula of “Your mother's like——; she——,” or “Your mother's so——, she——.” Examples are “Your mother's like a door-knob; everyone gets a turn” and “Your mother's so low, she could play handball on the curb.”
  2015, Simon J. Bronner, Encyclopedia of American Folklife