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

From STEM, an abbreviation short for "Science, Technology, Engineering and Mathematics", a STEMlord is a pejorative term for a particular kind of person who has studied in these areas at university or works in these fields who holds a pretentious, condescending attitude to anyone who has studied in any other fields, particularly the Arts and Humanities. They typically believe themselves to be more "intelligent" and "rational", while generally remaining incredibly ignorant outside of their areas of expertise and having the charisma of a rotting pig's backside.

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.