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]

1590s, from up (adv.) + stairs (see stair). As an adjective from 1782. The noun is first attested 1872. Adjectival meaning "characteristic of upstairs life" (in private rooms of a household, as opposed to servants' quarters) is recorded from 1942.

He [Halifax] had said he had known many kicked down stairs, but he never knew any kicked up stairs before. [Gilbert Burnet, supplement to "History of My own Time," from his original memoirs, c. 1697]