When one user questions or attacks another user, and the 2nd instantly accuses them of being a "troll". Often the first resort of those on shaky ground.
PD: "I don't think Asians should date Blacks."
Goldwing: "That's because you're a dumb racist."
PD: "Troll alert!"
Count X: "Man, don't even play the troll card, you racist shitbag."