gay

Happy or cheerful.

Example: I'm very gay today!

Colorful, festive or bright.

Example: Don we now our gay apparel....

A gay person is usually a man sexually attracted to males; also a woman attracted to females..

Example: Gay marriage used to be impossible, but it's becoming more common.

Stupid, not cool, it's exactly the antonym of senses 1 and 2.

Example: This game is gay. Let's play something else.

A homosexual person. This is usually a man, but could be a woman (lesbian).

Example: The gays were marching in protest yesterday.