up and

up and (do something)

To do something quickly, unexpectedly, or abruptly, especially without warning or explanation. I must have offended him, because halfway through the conversation he just up and left. The town has been in a panic searching for a young girl who up and vanished over the weekend. Everyone asks how I came up with the story, thinking it must have taken all this time and planning, but the truth is one day I thought up the premise and then I just up and wrote it.
See also: and, up
Farlex Dictionary of Idioms.

up and

Abruptly and unexpectedly: They up and left without saying goodbye.
See also: and, up
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
  • up and (do something)
  • up and did
  • up and leave, go, etc.
  • abortive action
  • take (something) in good part
  • take something in good part
  • take something personally
  • take (something) personally
  • take personally
  • personally
References in classic literature
It had been raining 'most every day for three weeks, and it was just in haymaking time, and everybody thought the hay was going to be ruined, and old Layton got up and prayed that God would send gentle showers on the growing crops, and I heard Uncle Roger whisper to a fellow behind me, 'If somebody don't choke him off we won't get the hay made this summer.'"
When he swallowed it he looked up and says, solemn as an owl, 'Give it to me oftener and more at a time.'"
Uncle Roger had never done such a thing in his life and he turned as red as a beet and looked down and muttered, 'E-r-r, please excuse me--I--I'm not accustomed to doing that.' Then he looked up and the old lady said 'Amen,' loudly and cheerfully.
Bud Dixon would wake up and miss the swag, and would come straight for us, for he ain't afeard of anything or anybody, that man ain't.
He allowed we would steal the bogus swag and wait all night for him to come up and get drownded, and by George it's just what we done!
"Tink," he rapped out, "if you don't get up and dress at once I will open the curtains, and then we shall all see you in your negligee [nightgown]."
To show that her departure would leave him unmoved, he skipped up and down the room, playing gaily on his heartless pipes.
"If he wakes up and his body doesn't feel right or he just doesn't think he has it that day, he just takes the day off,"he told Yahoo Sport.
It is sprung so that you lift it with one hand and it comes up and over through 270 degrees.