cock ‧ y /ˈkɒki $ ˈkɑːki/ BrE AmE adjective informal
[ Date: 1500-1600 ; Origin: ⇨ ↑ cock 1 (2) ]
too confident about yourself and your abilities, especially in a way that annoys other people:
He’s a cocky little man and I don’t like him.
—cockily adverb
—cockiness noun [uncountable]