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2.
A code used by the homosexual community to let others know what they're "into". i.e. if a boy wears a light blue hanky in his back pocket, that means he's into oral sex.
Hey, the hanky code says that guy would be into you!
by Ky December 25, 2004
 
1.
Wearing a colored hanky to identify sexual preferences within leather, or BDSM community. The color dictates your interest(s).

Black: Paingames, Whipping

Dark Blue: Fucking

Brown: Shit

Grey: Bondage

Red: Fisting

White: Wanking

Yellow: Piss

Which pocket is also important: left = top, right = bottom
Mike: Hey Jimmy, why does Paulie have a red hanky in his right pocket?

Jimmy: Oh that? He just wants some guy to stick his fist in his ass. That's his hanky code.

Mike: Well why do you have a brown one in your left pocket?

Jimmy: Go away.
by Bok May 11, 2006