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Extremely greedy. Never ever shares. Does not even consider anyone or anybody.
Person 1: Let me get some of that.
Person 2: No!
Person 1: Dude, you are so shysty!
Shysty by Pur October 4, 2006
Related Words
adjective..
unfair, injustice;
synonym: grimy
common mispelling: sheisty, shyT, shisty

shy-stee
Kids: can we go outside today
Teacher: no weve got to work today
Kid: awww man dats shysty
teacher: what did you say to me> detention!
Kid: thats some shysty shit.
shysty by O Brilliant One April 30, 2006
To me the definition of shysty is a bitch. Not a bitch in the seance of a female or a dog, but a bitch in the sense of a person who dose deceitful devious shit.
If you go out your way to go behind someones back than your a shysty bitch.
If every word that comes out of your mouth is a lie you's a shysty ass bitch.
But when you lie to me about some bullshit and wont let me brake up with you because you want to wait until ya hoe ass finds a another "victim" and then break up with me almost a month after i broke up with you annd then try your damdest to be "cool" with me....
I got news for ya girl. YOU'S A MOTHA FUCKIN SHYSTY ASS MONKEY COCK SUCKIN DIRTY HUNGRY ASS BITCH
ShaQuaQua is a shysty ass back stabbin BITCH!!!!
shysty by Cordiar January 3, 2008
scummy, creepy, something that leaves you with a bad vibe
That guy leaves me with a bad vibe, he's shysty.

or

That's really shysty.
shysty by Tamsin September 27, 2005
One who changes,acts differently or treats friends not like friends
Man ever since dey done came back from bien wit da seniors dey been actin shysty
SHYSTY by KAILIP February 17, 2008

shyshyshy 

Twice member Sana sang 'shyshyshy' in their recent m/v,Cheer Up. It has become a new catchphrase for ONCEs,the fandom name for Twice.
"I was meeting my friend,shyshyshy" sang Sana.
shyshyshy by twicemybae May 11, 2016