Alternative for Shit Stirrer, used to describe a person that loves to cause trouble for others. Pronounced shite-ster. Used prominently in the rough areas of the UK.
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.