blunder noun 1. a stupid or careless mistake. "he stopped, finally aware of the terrible blunder he had made." verb 1. make a stupid or careless mistake; act or speak clumsily. "he knew he'd blundered." in which footballer robert lewandowski, gets given the wrong number. and when a lonely welsh woman meredith cozart, receives a text message from an unknown individual. ==Mature Content - Strong Language and Possible Dirty Jokes== -uppercase apart from the text messages-