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When you are at a wedding and two guests from the wedding(or people who happen to be there) hook up during the ceremony
In 27 Dresses Kevin and Jane make-out at another girls wedding.

Hannah: So, how was your wedding?
Serena: There was some guesting going on at the same time as my kiss with John. That bitch and her idiot bf ruined my wedding!
by sourpatch900 March 25, 2009