A person who insists on saying 'naaaw' to every little thing that even resembles cuteness.
A - Oh, look at that poop.. it's shaped like Jesus
B - NAAAAAAAAAAAAAWWWWWWWWWWWWWWWW!
A - Oh you're such a nawzi..
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A - Whats a nawzi?
B - A person who always says 'naaaaw'...
A - NAAAAAAAAAW!