bighead

1. (countable, colloquial, especially used by children) A person with an inflated opinion of themselves; a conceited or arrogant person.Examples: "He is such a bighead and so lazy that I don't know how far he will go. He can read and write English a little bit and he thinks that is enough for him to know."; "'But there are too many egos, way too many. I mean bigheads who are sidetracked by stuff away from football.'"; "I'm not such a bighead that I think I can do better than Hugh and Hereman at reclaiming the main island."colloquialcountableespecially

2. (countable, colloquial) Any of several species of fish having a large head.colloquialcountable

3. (uncountable, colloquial) Any of several animal diseases that cause swelling of the head.colloquialuncountable