Human Donut
A person who's head is so far up their own ass that they become donut shaped.
"Dude, David is so annoying. He just finished reading The Stranger and now he won't shut up about how life is meaningless. The worst part is he talks about this bullshit like he invented it."
"Yeah man, he's becoming a human donut."
"Yeah man, he's becoming a human donut."