Flame is a noun that refers to the visible, gaseous part of a fire. It can also be used as a verb meaning to burn brightly or to send angry messages online.
In internet slang, "flame" refers to:
1. Angry or insulting messages posted online
2. A heated argument in an online forum
3. To criticize someone harshly in an online discussion
Other meanings of "flame" include:
1. A sweetheart or lover (old-fashioned usage)
2. A brilliant orange-red color
3. In computing, a flame is an error message in some programming languages