f'pants
A fancy word for someone who's way too proud. It can also mean something really good, but it's still full of itself and doesn't know when to stop.
That kid is a f'pants. He won a game and now he thinks he's the best at everything.
That cake was f'pants. It had ten layers and cost more than my allowance.
He said my joke was f'pants. I told him to stop being so full of himself.