This is a word used to express when a person is having a lot of fun( in a naughty way!)
A very naughty behaviour

a big hand in cards, usally the winner,

Masti is a rare and weird name.
But if you meet someone who's name is masti then let me tell you, you're really lucky.
Masti is a sweet, gorgeous, kind hearted and funny girl.
She sometimes has her 5 minutes (getting weird& laughing) and she's not truly herself until she feels comfortable with you.
But once you get to know her, you don't want her to leave anymore.
Although she's kinda clumsy, she still listens to your problems and is a good& loyal friend.