streaker, n. — Green’s Dictionary of Slang

streaker n.

[originated on US campuses, where it amounted to the trad. mooning (cf. moon n. (1e)), writ much larger, then transferred into a variety of larger arenas, notably the venues of major sporting events around the world]

(orig. US) one who runs naked through a public place.

1973		Time 10 Dec. 14: Streakers generally race nude between two unpredictable points, and the idea is catching on among college students and other groups.
1985		‘Thommo’ Dict. Aus. Swearing & Sex Sayings 126: STREAKER — A person who strips off all their clothes to run naked in front of a large crowd, and thrill the cop that catches them.
1999		Guardian Rev. 10 July 12: ‘We have a streaker! No, we have two streakers!’ he cried.
2000		Indep. Rev. 3 June 4: A streaker on a rugby pitch.
2011		Observer Mag. 1 May 43/1: We had a streaker once [...] he ran naked through the Music and Junior [library departments].