closet queen

noun, Slang: Disparaging and Offensive.
1.
a contemptuous term used to refer to a homosexual male who denies his homosexuality to himself or keeps it hidden from others.
Origin
1965-70; closet (in the sense of ‘secret’) + queen (in the sense of ‘male homosexual’)
British Dictionary definitions for closet queen

closet queen

noun
1.
(informal) a man who is homosexual but does not admit the fact
Slang definitions & phrases for closet queen

closet queen

noun phrase

A secret male homosexual (1960s+)