What is a troll?

Looked it up.   Now, I understand what a troll is...  

 Here is my question, how can I be a troll on a blog that I write?    Isn't someone, who posts a comment on a blog that I write, calling me a troll by definition a troll him or herself?

2.	troll	2990 up, 797 down
	1a. Noun One who posts a deliberately provocative message to a newsgroup or message board with the intention of causing maximum disruption and argument. 1b. Noun A person who, on a message forum of some type, attacks and flames other members of the forum for any of a number of reasons such as rank, previous disagreements, sex, status, ect. A troll usually flames threads without staying on topic, unlike a "Flamer" who flames a thread because he/she disagrees with the content of the thread. 1c. Noun A member of an internet forum who continually harangues and harasses others. Someone with nothing worthwhile to add to a certain conversation, but rather continually threadjacks or changes the subject, as well as thinks every member of the forum is talking about them and only them. Trolls often go by multiple names to circumvent getting banned. 2a. Noun Sometimes compared to the Japanese ‘Oni’, a troll is a supernatural creature of Scandinavian folklore, whose race was thought to have carried massive stones into the countryside (although actually the result of glaciers). Lives in hills, mountains, caves, or under bridges. They are stupid, large, brutish, hairy, long-nosed, and bug-eyed, and may also have multiple heads or horns. Trolls love to eat ...