Gay: a person who is attracted to the same sex/gender and who marries dates or has a romance with. Shouldn’t be used to describe someone in a inappropriate way, it is not a thing to joke about. Same thing as lesbian.
adjective
1.
(of a person, especially a man) homosexual.
"that friend of yours, is he gay?"
synonyms: homosexual, lesbian; informalqueer
"gay men and women"
2.
lighthearted and carefree.
"Nan had a gay disposition and a very pretty face"
noun
1.
a homosexual, especially a man.