Unknown. Possibly from get up and. Possibly a dialect use of up (verb)
- (colloquial) Abruptly; unexpectedly.
1990, Archie Weller, “Johnny Blue”, in Going home: stories, page 41:
- When he saw me hand and face, he up and goes for the head's office before I can say 'struth' and, by the time I can get after him, it's too late.
2001, Charles G. Roland, Long night's journey into day: prisoners of war in Hong Kong and Japan, 1941 ..., page 193:
- a friend of mine who, within ten days, said 'I've had enough of this' and he just up and died. It seemed he wished himself to die.