You and another person type the same thing at the same time on someones wall, status message, photo, note, or any other place you could make a comment.
joe blow's status message -

joe blow is kissing his girls happy spot

josh:(7:03pm) yeah right we all know you're gay
John:(7:03pm) yeah right we all know you're gay

the above is a facebook jinks at which point normal jinks rules apply.
by Josh Curtis October 15, 2009
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