Hi Lee Lee-
Trolling and flaming are two internet terms to describe troublesome behavior.
A troll is someone who comes on a message board and posts something that is very disturbing emotionally. If could be anything really, most of the trolls that land here try to touch on the sensitive subjects like spaying and neutering, declawing or disciplining a cat. They apparently get their giggles by getting others very upset, and sometimes it is hard to figure out if we are being played or not.
Flaming is when a thread gets personal by someone throwing around insults at another, hurting people's feelings intentionally by telling them off in a crude manner. All the mods do a great job at stopping these posts from getting out of control. Sometimes, the post will vanish for awhile, get cleaned up and put back. Worse case scenario is it vanishes altogether or gets locked down.
Hope this helps!