Sort of like "you do you," but with a strong implication that you're talking out of your ass. Basically "you're an idiot and what you're saying is stupid, if you want to keep going I guess I won't stop you."
What you say when someone tells you something he thinks is hilarious but really isn't. You say this to avoid hurting your friend's feelings in breaking it to him that his joke sucks.
Dudeman 1: "Oh man, I was playing horseshoes in Red Dead Redemption and I got a really close throw and John was all like, 'Did you see that!' It was so funny dude!"
Bill Wurtz makes a 20 minute video where he sings a lot of songs, makes a religion about things, turns the sun into a deadly laser, conquers all... er, most of India, and breaks China a lot.
Dude: Have you seen history of the entire world, i guess?
Other Dude: Duh! THE SUN IS A DEADLY LASER!
Dude: Not any more, there's a blanket.
a genius video made by Bill Wurts, explaining the history of the entire world as he assumed by reading a lot of shit on Wikipedia, from the start of the universe to the current day. you should go watch it and subscribe to him.
"Have you seen "the history of the entire world, I guess"?"
"nope wtf is it"
"It's a funny video explaining the history of the universe"
"why"
"the sun is a deadly laser"