Trolling refers to any behavior that is meant to intentionally anger or frustrate someone else. It is often associated with online discussions where users are subjected to offensive or superfluous posts and messages in order to provoke a response.
In Internet slang, a troll is someone who posts inflammatory, extraneous, or off-topic messages in an online community, such as an online discussion forum, chat room, or blog, with the primary intent of provoking other users into a desired emotional response or of otherwise disrupting normal on-topic discussion. In addition to the offending poster, the noun troll can also refer to the provocative message itself, as in “that was an excellent troll you posted”. While the term troll and its associated action trolling are primarily associated with Internet discourse, media attention in recent years has made such labels highly subjective, with trolling being used to describe intentionally provocative actions outside of an online context.
Trollface (Trollface / Coolface / Problem?) is a black and white drawing of a face with a large mischievous grin that is meant to portray the expression someone makes while trolling. Posting a Trollface image into a forum thread is often used to claim that someone was being fooled or intentionally angered. The face commonly appears in rage comics indicating that the character is being mischievous in some way.