nahtameen
A fancy way of saying 'na meen' that only East Londoners use. It's like when you're being a bit of a tosser and you think you're cleverer than everyone else.
'He said he'd beat me in a fight. Nahtameen!'
'She kept talking about her holiday like it was the best thing ever. Nahtameen!'
'He thought he was the king of the street. Nahtameen!'