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To smack someone on the back of the head with an open hand. Derived from the trademark slap delivered by the character Leroy Jethro Gibbs to his underlings on the T.V. show N.C.I.S. To deserve a 'gibbs' or a 'gibbs-smack' the person getting it should have done something stupid, vain or dangerous.
When I found out he was cheating on his gf that was one thing; when I found out the asshat was hitting on jailbait in her favorite bar, I gave him a gibbs he'll never forget.
gibbs by shoopyou April 1, 2009
Related Words
Former marine gunnery seargent,Leroy Jethro Gibbs, the main character on the hit tv show NCIS, played by Mark Harmon.

also known as "Bossman", "Boss", and "Silver Fox".

aka: the most amazing man to ever grace the world with his presence.
Ex: Person 1: "Hey, you know who ISN'T reading this definition???"

Person 2: "GIBBS!!!!"
Gibbs by GibbsGirl August 24, 2009
To roll. Any form of the word roll can be used in this context.
'I totally gibbs'ed my car going round that bend too quickly'
'Can you gibbs me a cigarette please?'
'I had a lovely cheese gibbs the other day'
Gibbs by H.Dawg January 9, 2012
a legendary god who pleasures females until ecstasy with his large penis

(also has 12 testes)
ohh my gog look at gibbs and his massive manpole
Gibbs by Gog December 20, 2004
Absolute fucking legend! Known as an ancient Australian god.
He is a Gibbs
Gibbs by The Bunnings sausages February 6, 2017
I have got a couple of gibbs in me purse. OR I ain't got any gibbs to go out tonight.
gibbs by Ems August 5, 2003