I have come across numerous posts/memes on social media where, considering A,B and C are different people:
A posts something seemingly innocuous.
B comments on A's post, something either very funny or offensive to A
C comments "BURN!!" with some ROFL emoticons
Not the best question, but I am just curious why people say "BURN", when they need to mock/insult other people? (according to UrbanDictionary).
How did this usage come into existence?
Is this used only in social media? Or is it used in real world conversations as well?