The rough translation of Zettai ryouiki is known as “absolute territory”. It’s defined by the area of bare skin seen between a skirt and thighhighs. The ultimate level Zettai Ryouiki is set as 4:1:2.5 (length of mini-skirt : absolute territory : length of overknee socks above the knee).
Person #1: "Holy shit, that girl's legs look super delicious!
Person #2: "I believe she has acomplished zettai ryouiki my good man."