The story
Borrowed from Japanese 絶(ぜっ)対(たい)領(りょう)域(いき) (zettai ryōiki, literally “absolute territory”).
Etymology from Wiktionary, CC BY-SA 4.0.
zettai ryouiki
Today it means: The area of bare skin above the top of above-the-knee socks but below the hemline of a miniskirt or pair of shorts. Full definition →