A functioning homosexual is a gay person who has not given
thier life over to the drama associated with their sexual orientation.
A homosexual who can pass as straight when the need arises.
Someone like Will on Will and Grace.
Gay Dude 1: It's amazing how calm Bob was when Brucie had
his meltdown at the GLT meeting last night.
Gay Dude 2: Bob is very good at keeping it together, he is quite
the functioning homosexual.