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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.
by shoopyou March 30, 2009
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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!!!!"
by GibbsGirl August 24, 2009
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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'
by H.Dawg January 06, 2012
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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
by Gog December 20, 2004
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Is a large flightless bird only found in Essex . it has a large breast with colorful plumage of which is often dribbled on .
The Gibbs bird can often be found at a second floor level eating scraps they buy from the pound shop...
from time to time they require company and turn to bears as their chosen boredom reliever . The bear, oddly, just plays with the bird . they watch shitty tv and talk shit .
the Gibbs can often be found at unnamed sandwich stores .

Should you come across a Gibbs duck and roll boys , duck and roll .....
ladies should just offer it treats till it come to your house .... they make great pets .

apart from that weird gingery smell !
person 1 : Thats a Gibbs bird isnt it ???
Person 2 : duck and cover before it see`s us

person 1 : its too late..... is carrying me off by the underwear ..

Person 2 : i told you not to use subway wrappers as undergarments
by Jeremy cuttlefish February 19, 2018
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A Teenager with an undeveloped body and an egg shaped head with a curvy nose, these people are VERY annoying and copy the nearest person to lickarse. can be delt with by ignoring or walking away, there has been a secret government campaign to execute all gibbs, but theres one out there who is still alive and making poeples life a living missery
is that an annoying tire screech? or is gibb talking? OH GOD PLEASE MAKE IT STOP!
by The Unknown Bandit May 10, 2008
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