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1.
a shady or shisty person; anyone that seems suspect

a person involved in shady activities or suspicious affairs

underhanded, sneaky, sketchy

something that makes you scratch your head because you can't belive some did that or an incident just happened

somone who steals, esp for fun

v. jacked, stole, took, ran someone's shit
Yo that kids a shista man; I heard he got caught for stealing socks just last week.

OK, who shista'd my records!

Shista shisty shady took my shit again!

Fucking shista, man, always doing some shit...
by Mr. Shista August 31, 2006
 
2.
Current operative system by Windows.
Ah man, my new PC has Shista. That blows!
by shistasucks August 11, 2009