Someone who loves to cause strife and turmoil. A masochist.
Look under "God" for definition
A girl/guy who you work with and doesn't do any work but insists that they are the best thing since sliced-bread and isn't. Then come time to present the work, they take one look at it and then they bitch about how they did all the work, then call you out on a petty mistake and make you look like a shithead.
That stupid girl in our office is such a Shit-disturber she ruined that proposal presentation.