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
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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 26, 2005
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Secret code in the gay community signaled by a handkerchief protruding out of one's pocket. It's used as a secret messaging system by gays to let each other know their sexual fetishes.
Nik: Look at Adam's friend Crad! Why is there a handkerchief coming out of his pocket?
Collin: Hankie code, brah.
by GuapoSmash July 16, 2014
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Yellow hanky codes are a system of yellow-coded fetish clothing and cosmetics for non-verbally communicating one's interests in watersports (also known as urophilia/urolagnia/undinism).
Young female urophilists, urolagnists, undinists and squirters use yellow hanky codes. They love to give you yellow hanky code signs, they turn you on with fetish wherever they can and they love to make you join the watersports scene.
by unkinkyjonas April 12, 2023
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