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Kaizer is a German word that means prince, but it also means someone who thinks they're royalty and acts like they own the place.
"You're just a kaizer, not a king!", said by a guy who got kicked out of a fancy restaurant.
"I'm the kaizer of this party.", said by a guy who didn't know how to dance.
"He walked in like he was the kaizer of the universe.", said by a guy who didn't even know the word.