絶対領域

Etymology
Literally, "absolute territory".

Thought to be popularized in 2001 by Yumehotaru (夢蛍, username), the creator of the  desktop mascot Mayura, while Yumehotaru believes it was first used by MIY (username), the creator of the Ukagaka desktop mascot Seriko (せりこ).

Noun

 * 1)  exposed skin of the thigh between the hem of a miniskirt and thigh-high socks