From Longman Dictionary of Contemporary Englishclunkerclunk‧er /ˈklʌŋkə $ -ər/ noun [countable] American English informal 1 TTCOLD/NOT NEWan old car or other machine that does not work well2 something that is completely unsuccessful because people think it is stupid or wrong
Examples from the Corpus
clunker• Studio executives should have put Jonathan Winters in a good show, not a clunker like this.• It isn't a solitary clunker that produced a 103-85 loss to the Miami Heat that is offensive.• It is also filled with unintentional clunkers that elicited inappropriate but inevitable laughs in this reviewer's living room. 