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Shady or sneaky in nature. Usually describes a person.
A guy took coworkers money for movie tickets that turned out to be cheaper than he quoted and he did not mention it to his coworkers or refund the money... That's one sheisty asshole.
sheisty by Darci "Dirty-D" September 9, 2004
Related Words
Dates back to a 1850s lawyer in NYC using very ambiguous methods to obtain right in law suits. As his surname was something like Sheister a judge used "sheisty" as an adjective referring to methods that are immoral, impure, two-faced, opportunist, unreal, fake.
He's a sheisty guy. Don't use sheisty methods.
sheisty by arturelis October 18, 2004
Steisy is a nice girl, has a great heart, and is very great artist that will never let you down. She loves coffee and will drink over 20 cups a day!!! She may be very sensitive, a bit shy, and calm around others, but will always be there for you when needed most.
Art Teacher: Who would like to draw the school poster?
Every other student in the class: Steisy should draw the poster, after all, she an amazing artist!
Steisy by Starmel(from anime) December 1, 2020

sheist/ sheisty 

a lying, cheating, dishonest, stealing, or simply shady mother fucker who steals $40 from his neighbors purse and makes you pay for pizza that night!!! what the fuck
I know that sheisty bastard cris stole my shit but hes not admitting to it...even though i saw him do it.
sheist/ sheisty by "Jeremy" April 17, 2003

Sheisty  

To be sheisty,to be a sheist:

To succeed sneakily with mallice
To venture covertley with intent for a personal gain in an subtle manner (sneeky manor)
ie. when your cat steals your spot on the couch he examplifies the true nature of a sheisty mother fucker
note: chanage the spelling and you are sheisty mother fucker
shut up eat a dick
Sheisty by drunkards May 10, 2008
A modern adjectival outgrowth the noun "shyster." The original term refers to someone who behaves in a disreputable or unethical fashion. Thus a "sheisty" person or behavior is one which appears overtly, even lewdly, unscrupulous.

The origin of "shyster" may be from the German "Scheißer" meaning pooper (MW) or from the old use of "shy" meaning disreputable (OED).
The guys at that party were completely sheisty.

You look really sheisty when you grease your chest.
sheisty by sheistamatic October 4, 2011