upskirt (adj.)youdaoicibaDictYouDict[upskirt 词源字典]
by 1997, from up (adv.) + skirt (n.). As a verb by 2008.
"Upskirt" videos, usually taken using low-hanging bags, feature up-close-and-personal crotch shots of leggy, panty-clad young women. ["Weekly World News," Sept. 29, 1998]
[upskirt etymology, upskirt origin, 英语词源]