An adjective describing the phenomenon when a stereotypically gay person is attracted to another stereotypically gay person. (Countering the societal stereotype that butch lesbians are attracted to feminine lesbians and feminine gay men are attracted to masculine gay men.)
Term originates because the person is gay in terms of what sex they are attracted to, but doubly gay because they are attracted to someone of the "same sex" in terms of personality.
That butch womyn is double gay; she likes other masculine girls.
That flamboyantly feminine guy is double gay; he loves other feminine gay guys.