Bob is gay and seems to show no obvious gay mannerisms, but when he is around more intimate friends or by himself, he becomes a Camp Gay.
Bob is really straight after all.
Doubly Subverted: Bob is gay and seems to show no obvious gay mannerisms, but when he is around more intimate friends, he becomes a Camp Gay... but it turns out he does that just so he can fit in with them, and isn't Camp Gay naturally.
Parodied: Bob has no gay mannerisms and never acts gay, to the point where no one has any reason to believe that he is gay other than the fact that he says he is, leading to Have I Mentioned I am Gay?, as well as hilarious misunderstanding.
Bob shows no gay mannerisms, but acts Camp Gay around his gay friends, but when he comes home, he loses the gay mannerisms, but then he wishes he weren't in the habit of hiding them, but then it turns out he isn't gay at all...
Defied: Bob tries to show gay mannerisms, even though they don't come naturally to him, to avoid being a Straight Gay.
Discussed: "I know Bob isn't flaming, but that doesn't mean he isn't gay."
Conversed: "Just because Bob is Alice's gay best friend on this show doesn't mean he needs to act like a poof; not all gays are flaming, you know."
Deconstructed: Bob's insecurities about being gay cause him to play up his "manliness" and actively avoid gay-themed places and events even if he would enjoy himself, whether anyone is actually questioning his masculinity or not. Furthermore, he will only date men as "straight-acting" as he is.
Bob is able to use his lack of gay mannerisms to avoid other peoples' gaydar, helping his career or allowing him to go unnoticed in a homophobic area. More generally, Bob's lack of gay mannerisms allows the audience to see him as a well-rounded character, rather than a token gay.
Bob flat-out rejects what society keeps telling him. He can be gay and still be a normal guy if he damn well pleases.
Played For Laughs: Bob's lack of gay mannerisms is used as the butt of a joke.
Played For Drama: Bob doesn't show any gay mannerisms because he is afraid of people finding out his sexuality, for fear of homophobia.