This is what you say when someone says/does something stupid.
Usually the hand is extended and is pointing towards the intended person.

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.

A slang term used for making fun/roasting someone

Can Be Used When:
1) When You Hardcore Roast Someone Like He or She is Thanksgiving Dinner.
2) When You Be Trying To Explain Something That Shouldn't Need To Be Explained.
3) OH SHIT WHAT UP!

Boi is a very rare species of frog found only in the north coastal area or at the Gulf stream. They eat bees, flies, and sometimes birds. They are carnivores and, instead of using their legs, they ride a one cycle bike for transportation. They are light green with small, black eyes. They can also speak some of the human language!

meme-o supreme-o

A saying when someone does or says something stuipd.