I think “Troll” has existed ever since dumbasses roamed the internet.
“Damned be the day that befalls us in a most hostile manner that shall compromise our Country, and damned be the great lengths at which are required of to stir our Patriotism.” - Anonymous
in usage, st00’s def is the right one.
what they look like is the “under the bridge” one
and the fact that more of them are on the internet than in stocked ponds is equally true.