Definition of blooper noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈbluːpə(r)//
; NAmE NAmE//ˈbluːpər//
(especially North American English)
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an embarrassing mistake that you make in public Word Origin1926 (originally US, denoting a radio which caused others to bloop, i.e. emit a loud howling noise): from imitative bloop + -er.
See the Oxford Advanced American Dictionary entry: blooper