pack up your flaps - Telling someone to get their butt out of wherever they are b

Telling someone to get their butt out of wherever they are before you lose your cool.

Your mom just yelled, 'Pack up your flaps, or I'm gonna throw your Xbox out the window!'

Your boss said, 'Pack up your flaps, or I'll make your coffee taste like motor oil.'

Your friend whispered, 'Pack up your flaps, or I'm telling your crush you're a disaster.'