1. n. an ugly person; a grouchy person. Gee, that dame is a real troll. What’s her problem?
2. n. an internet user who sends inflammatory or provocative messages designed to elicit negative responses or start a flame-war. (As a fisherman trolls for an unsuspecting fish.) Don’t answer those silly messages. Some troll is just looking for an argument.
3. n. a message sent by a troll (sense 2). Every time I get a troll, I just delete it.