From Longman Dictionary of Contemporary Englishbloomerbloom‧er /ˈbluːmə $ -ər/ noun 1 → bloomers2 [countable]MISTAKE British English old-fashioned an embarrassing mistake that you make in front of other people – used humorously SYN blooper American English
Examples from the Corpus
bloomer• He parodied my groping stumble across the stage to the podium and gathered up the skirt to reveal hairy legs and bloomers.• The first thought that came to me was that I hadn't got my clean bloomers on.• A bee in her butt, a burr in her bloomers.• Over the course of the year, Farnham learned how to shingle a roof, wear bloomers, and repair a fence. 