Second hand gay is when your girlfriend tries to kiss you after giving you a blowjob. Second hand gay will only apply to you if you actually kiss her back.
Noah: My girlfriend sucked my dick last night and tried to kiss me.
John: Please don't tell me you actually kissed her!
Noah: Yea I did. Whats wrong with that?
John: Dude thats second hand gay!
The way in which gay men move their hands to point out something, or just to simpley provide emphasis for whatever the happen to be talking about. A flashy and girly way the hands of a gay male move whenever they are talking.
Tom: I think Rob's gay. When he was picking out movies at the video store, he was using his gay hands. That's a sure sign!
A social faux pas in which you stroke the other party's palm with your index finger during a normal handshake. Can be seen as a sexual advance and it just feels really creepy. Go ahead, try it on someone.
The dignitaries at the UN were disgusted when Tom stealthily caressed the Japanese ambassador's hand with a gay handshake.