used in chat/AIM slang as a way to denote that the other person has just received a minor slap to the back of the head, like what Leroy Jethro Gibbs gives his team.

The slap is a punishment, usually done when the person has done/said something stupid.

Can be used as an expression of aggravation
H0tChick101: I met this hot guy...
TalkaTalk20: His name?
H0tChick101: James. He's tall, auburn haired, and hazel eyed.
TalkaTalk20: <Gibbs>. That's my boyfriend.

DiNozzo: I've got this great new toy
McGee: Great, now we won't hear the end of it
DiNozzo: <Gibbs> Probie, come on
by Sans0uAvecV0us March 23, 2009
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A word used to acknowledge fuckboy athletes by their masogonistic mates in a way that disguises and celebrates their toxic masculinity.
Matt: *sleeps with whole swim team*
Friend: On ya, gibbs!

Friends: watch out, gibbs is on the move!
Jess: why do they call you gibbs when that's not your name?
Gibbs: ummm ... don't worry it's just a joke.
by GirlCode2022 August 4, 2023
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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 6, 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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Absolute fucking legend! Known as an ancient Australian god.
He is a Gibbs
by The Bunnings sausages February 6, 2017
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