The phrase "whoops up" is an informal idiomatic expression used to describe someone making a mistake or failing to do something correctly. There are several synonyms that can be used interchangeably with "whoops up," including flubs, blunders, goofs, slips, missteps, and falters. These words all convey a sense of human error and imperfection, suggesting that the person in question has made a simple, unintentional mistake that can be corrected with little effort. While "whoops up" is a more colloquial expression than some of its synonyms, these other terms offer greater precision and nuance in describing the various forms of mishaps and mistakes that can occur in everyday life.