Coined by Sex and the City. While a gay straight man is an overcultured straight man (a metrosexual), a straight gay man is just a gay man who watches sports and won't fuck you.

The difference is sort of that between crayola's green-blue (blue with a green tint) and blue-green (green with a blue tint).

Internet persona(s) who happens to follow you and you happen to follow them back and maintain communication with and have a mutual liking for eachother whether it be friendship wise, etc. (Mutuals if more than one mutual)