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"hoax, deception," 1884, spouf, name of a game invented by British comedian Arthur Roberts (1852-1933); sense of "a parody, satirical skit or play" is first recorded 1958, from verb in this sense, attested from 1914.
To gain access electronically to a computer deceptively and perhaps illegally: I thought someone might be electronically impersonating him, a practice that is known online as ''spoofing''/ The technique is called ''spoofing'' because it fools a computer into thinking that another, friendly computer is requesting access (1990s+ Computer)
To fool; hoax; tease: He was just spoofing (1889+)
[coined by the British comedian Arthur Roberts, born 1852, as the name of a nonsense game he invented]