A Troll who posts an extremely large picture post for no reason other than to aggravate people. This forces others trying to make it to the recent post to scroll down through the large picture. This kind of activity can be found on internet forums.
Scroll Troll: (Huge Picture Post)
Person: Dude, shut the fuck up you Scroll Troll.
A troll who scrolls upward in IRC or an IM client to bring to bear something someone said at least an hour past.
"Stop scroll trolling, you stupid fuck."