This is a word used to express when a person is having a lot of fun( in a naughty way!)
A very naughty behaviour
Raj: What masti where you doing yesterday at Sabrina's house?
Hunk: No masti! We were just finishing out homework.
by ClownOfRevolution April 13, 2019
Get a Masti mug for your brother-in-law José.
A shortened version of Masturbation
"What did you do last night?"
"I had a masty."
by Invaderzim44 March 26, 2010
Get the masty neck gaiter and mug.
Noun. The act of male masturbation; a jerk-off. Generally used within the phrase "have a mastie" or "having a mastie"
After he realized that he wasn't going to get laid that night, he decided to have a mastie and go to sleep.
by Ms. Robinson August 27, 2006
Get a mastie mug for your mama Yasemin.
Noun: the act of masturbation

Verb: to masturbate in the absence/or for the replacement of real sex (not to be used by those who are getting the real "nasty" because it's just not fair for them to be both entertaining and gettin' some)
Noun: I love to do the masty

Verb: I got all masty with myself last night and it was niiiiiicccceee....
by Bisco G August 16, 2009
Get a Masty mug for your buddy Jerry.
A word used by the chronically ill and/or invisible illness community to refer to people who are diagnosed with a mast cell disorder - generally either Mast Cell Activation Syndrome (MCAS) or mastocytosis. "Mastie" is a cute name to refer to the person diagnosed with the condition. It's shortened for easier usage.
"You have MCAS too? Wow, I've never met another mastie before!"
by VocalContributer October 07, 2019
Get a Mastie mug for your mate Manley.
Verb originating from the noun masturbation. Used as slang in small parts of South-East England such as Harwich. Means the same as wank; jerking it; jacking off etc

wank masturbation jerking off jacking off
Our mate Tango was rustling in the night, I could have sworn he was having a masty so now he's known as Masty Tango
by MastyTango March 10, 2016
Get the Masty neck gaiter and mug.