A person that identifies as male that is attracted to males.
“Mum I think I like boys”
“You must be gay then”
means (depending the gender) you like guys (or girls) and you are the same gender and you most likely kissed them and enjoyed it
Someone married to the same gender or someone dumb and stupid.
“Oh look that couple is gay”
A person who is homophobic and hateful towrds the LGBT+ minority
Kyle: what a fag
Ron: Kyle stop being gay and say I do
(Both Kyle and Ron are getting married in Vegas)