A word or phrase used to describe someone in a negative way or to talk to someone abusively.

A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.

An insult is usually when someone says something rude or offensive to another person. Insults are usually used when someone is being annoying, but sometimes are used as jokes. Around 95% of people on the internet use insults, but only 1% of those use insults other than the following:
"Fuck you"
"I banged your mom last night" (This one is also said a lot in COD lobbies)
"Gay"
"Shut up"

A group of words used to verbally abuse another person

Something that is apparently VERY COMMON on this website...

A word or phrase used to mentally hurt someone.

A way to verbally make someone like you less.