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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!"
Mastie by VocalContributer October 7, 2019
a thing that looks prestigous, but is available to masses
Calvin Klein underwear is masstige. Klein rules, but basically everyone can afford it.
masstige by urmas January 13, 2004
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.
mastie by Ms. Robinson August 27, 2006

Mastigulate 

An involuntary execution of every bodily function all at once. such as sneezing, vomiting, bleeding, crying, farting, orgasm , sweating, defecating, salivating, urinating, hiccuping, having a seizure, etc. Generally associated with extreme stress.
That band is so awesome they'll make you mastigulate!

He tried to be smooth while talking to the super hot girl but instead he mastigulated.

Mastigulation 

The act of executing every bodily function all at once. Crying, puking, sneezing, bleeding, sweating, defacating, urinating etc. (use your imagination) normally brought on by extreme stress.
she was so hot she made me mastigulate.

As he entered the witness stand he began to mastigulate.

Mastigulation is common at Guantanamo Bay.

poo masties 

1, To finger ones ass while masturbating 2, To defecate in ones hand, and then use that hand to masturbate
Damn, i heard that Michael loves to get into the poo masties after listening to Elton John
poo masties by jigsaw666 April 8, 2008