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a loud, annoying person who thinks they're the king of the world and doesn't care if they ruin your day. they talk too much and never shut up.
My cousin is an obcockxious. He told me his whole life story at a pizza party.
That guy at the gym is so obcockxious, he flexed during my workout.
My teacher called my friend an obcockxious for making a mess in the classroom.