/ ˌkɒkˈʃʊə(r); -ʃɔː(r); NAmE ˌkɑːkˈʃʊr/ adjective
( old-fashioned , informal ) confident in a way that is annoying to other people and that they might find offensive
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WORD ORIGIN
early 16th cent.: from archaic cock (a euphemism for God ) + sure ; later associated with cock .