Going shopping after having a cocktail (or two, or three); shopping while drunk. Generally most noticeable the next day when you realize what you (probably shouldn't have) bought.
(At the checkstand) Wow, look at my cart - - I'm totally shrunking!
What was I thinking, buying that outfit yesterday? I must have been really shrunking!
Taking a job that is beneath a person's education or skill level as a means of retreat from adult responsibilities and/or avoiding possible failure in one's true occupation.
Although he was trained to be an architect, Hank took a job at Burger King instead because he didn't believe he'd be able to design a building that anyone would be interested in financing. His parents were disappointed by Hank's obvious occupational slumming.