Top Definition
To masturbate.
I'm gonna go home and have a right old fat masty
by Fanboy November 18, 2003

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A shortened version of Masturbation
"What did you do last night?"
"I had a masty."
by Invaderzim44 March 26, 2010

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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

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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 August 02, 2016

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Hypocrite Person who claims not to masturbate
I promise I don't masturbate. Bro, you fucking masty!
by KringleKraft January 21, 2016

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