troll

A person who favors a certain team or group, and then goes onto another team's message boards using a fake username and screws around on it.

(On Penguins Message Boards)
'Capssuck': " Alex Ovechkin is a much better player than Crosby"
'Malkin21': Get out of here you little troll, everyone knows you have a f***ing fake username."

7👍 14👎