Gillispie

Fake, made-up last name. Not real in any way, shape or form. Probably a psy-op.

Real guy: "I don't believe in the family name 'Gillispie'."
Gillispie guy: "Yeah, true haha. And the last name Real."
Real guy: "For sure."

Oklahoma

Unreal state. Avoid at all costs

Uninformed fellow: "I want to move to Oklahoma!"
Oklahoma survivor: "No."
Informed fellow: "I see."

Upside down

When something has it's top face facing downwards.

"I flipped a table and it was upside down"