1.One who is inflexible in his/her ways, rigid, intolerant of others (especially culturally), and believes he/she is always right; no debate will sway him/her.
2.One who uses way too many emoticons (25 to be precise, at all times).
3.One who is uneducated, uses improper English/grammar.
Adam: Did you hear that Sam and Alice got married?
Sara: They can't get married- he's a Greek and she's a Turk!
Adam: Please stop acting so StarTaurus.
Sara: What do you mean? (insert 25 "rolling eye" smilies here)
Adam: You are such a troll
Sara: Someone heres a troll all right but it's not me!