bar ‧ net /ˈbɑːnət, ˈbɑːnɪt $ ˈbɑːr-/ BrE AmE noun [countable] British English informal old-fashioned
[ Date: 1900-2000 ; Origin: Barnet fair , rhyming slang for hair , from Barnet , the name of an area of northwest London ]
hair, or a way of wearing your hair