a complete and utter wanker
A person who acts like they're king but ends up crying in the corner when they lose.
My friend is a complete and utter wanker. He challenged me to a dance-off and cried when he lost.
My neighbor is a complete and utter wanker. He yelled at the mailman for giving him the wrong paper.
My little brother called my dad a complete and utter wanker for forgetting his birthday.