1) An exceptionally awkward, obnoxious, or grating individual.
2) An exceptionally ugly girl that is overtly trying too hard.
1) "Dude, Austin has been here for 5 minutes and somehow has already smashed a window, puked on my carpet, and medlered my camera. Why is this troll still in my house?"
2) "That party last night was such a troll fest. I didn't know whether to cut my junk off to keep from getting raped or gouge my eyes out so I wouldn't have to watch."