the art of slapping the upside of your head, usually follows after someone says or does something insanely stupid. Leroy Gethro Gibbs started this trend in NCIS to knock some sense into his team.
Also can be used as a warning before a bitch slap.
Laura gave me a gibb slap after she found out that the fall off the roof hadn't hurt me.
Girl 1: My boyfriend and I broke up last night when I bitch slapped him for checking out another girl's ass
Girl 2: You should have just gave him a gibb slap and you two would still be together.
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A miss spelling of nothing; nothing in an upset manner
Kim: Hey you look a little down. What's wrong?
Claire: Nithing!! Leave me alone!
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