0 a boy who is chosen to have a special title and position at a prom (= a formal dance held for older high school students at the end of the school year):
He somehow got the title of "prom king" when he graduated from high school.
Like any good prom king, he arrived fashionably late.
Davis is a confident, all-American prom king with plans to go to college.
During his senior year, he was an all-state saxophone player and was elected prom king.
He was typically the lead in school plays and was also prom king.
Her former lover is shown at the prom, deep in thought, with his prom king crown askew on his head.
