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A British slang term for a particularly strong and addictive variety of marijuana, generally very expensive and rare.
Normal grass just isn't doing it for me at the moment, old chap... I think I'll procure some Gareth.
Gareth by FactFinder November 13, 2014
A man who has no idea of what is going on 95% of the time.
"Oi that Gareth over there is so cooked"
Gareth by woodzzaayyyyy November 22, 2016
A rapist. He has raped many people including his sister
Gareth was just here watch out
Gareth by Zia’s Lover November 6, 2017
Rhyming slang derived from the coffee adverts by popular 70s and 80s actor Gareth Hunt. Linked with his hand gestures in the ads which led to coffee beans.
FFS, that bloke is a complete and utter Gareth
Gareth has a small penis.
That’s as small as a Gareth
Gareth by Gdawgggggghgg September 9, 2020
"Gareth" is a name reserved for handsome yet humble narcissists.

Normally given to very special Swedish princes.

As a friend, organiser or business man you wont get better than a "Gareth".
How good at Football are you ?
I'm fxxxing brilliant - I'm even better than Zlatan - Im almost a "Gareth"
Gareth by BillyHilton September 16, 2020