An Adjective. A synonym for 'naughty.' Filthy, dirty, cheeky.
'Oh my God, did you check out how newty that girl was?!'
'Woah, that's pretty newty!'
'Check out her newty booty.'
a really cute girl that you see in your everyday life.
Aw look at that newty, she's such a cutie.
I'm so jealous I wish that newty was mine.