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A very sketchy person, someone who is up to something and won't tell you, do not trust this person
Wow... shannon's boyfriend is such a shadster.
shadster by Bessy January 7, 2006
Related Words

shagster 

one of them crazy white kids with shaggy hair that looks nasty as hell and curls at the ends
"that white boy is a shagster killin dat nasty hair"
shagster by DQ August 23, 2004

shasterbate 

person number 1: "oh wow Justin the football player, takes a long time in the bathroom"
person number 2: "hes probably masturbating while he shits"
person number 1: "haha, Justin shasterbates"
person number 2: "hahahaha thats clever. shasterbate!"
shasterbate by shexcelent December 1, 2009

shadester 

A person who cannot be trusted. Male or unisex version of shady lady.
G.W. is a real shadeser.
shadester by Valina M. & Oradoña October 28, 2004

shadester 

Someone who makes plans but never follows through by not returning phone calls or ignoring them. Also they cannot be trusted with anything and are usually lurkin around shit.
Yeah she said we were going to hang out this weekend, but she ignored me all week. What a shadester.
shadester by LRKN_NSTY August 4, 2008
A nickname used for the Irish name Shannon.
Shanster by KL88 February 13, 2009