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Douglas Harper's Etymology Dictionary
upskirt

by 1997, from up (adv.) + skirt (n.). As a verb by 2008.\n\n"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]

Wiktionary
upskirt
  1. Describing a voyeuristic image of the view up a woman's skirt. n. An image of this kind. v

  2. (context transitive English) To take a voyeuristic photograph up the skirt of (a woman), especially surreptitiously.

Wikipedia
Upskirt

Upskirt refers to the practice of making unauthorized photographs under a woman's skirt, capturing an image of her crotch area, underwear and sometimes genitalia. The term "upskirt" can also refer to a photograph, video, or illustration which incorporates an upskirt image. The term is also sometimes used to refer generically to any voyeur photography – that is, catching an image of somebody unaware in a private moment.

The practice is regarded as a form of sexual fetishism or voyeurism and is similar in nature to downblouse. The ethical and legal issue relating to upskirt and downblouse photography is one of a reasonable expectation of privacy, even in a public place.