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1.
Gareth refers to a person with a large penis. Someone who knows how to satisfy a woman both in the bed and in life.
"Hey Debs, how was that date last night?"

"It was great, he made me cum several times and even made me a cuppa in the morning. I've never been so satisfied. He is so hung. That Gareth is a keeper"

"Wow, I gotta go get me a Gareth"
by Debs.0 February 03, 2010
 
2.
Eating your lunch at your desk, while surfing the web. Then, once you've finished take an hour lunch break
Simon: Hey, is Paul on break?

David: Nah, he's doing a Gareth
by Jay-Lo October 17, 2006
 
3.
from the welsh meaning noble and honourable. A very common name within Wales often shortened to Gaz or gar. Also the best hubbie in the whole wide world.
Me "Gareth can you make me a cuppa?"

Him "Course honey x"
by babyd0ll February 02, 2010
 
4.
A Gareth will be the best person you will ever meet. He'll be your favourite because he makes you laugh.

A Gareth will be very musical and passionate and he cares for things too much. He gets along with everyone and is easy to be around but he'll only dedicate himself to a few people.

A Gareth is self-critical and analytical, making him logical, level headed and incredibly easy to admire.

His smile shows in his eyes. He doesn't have to be anything else but himself to love every single bit of him.
'So who you completely mind blowingly over heels in love with this time?'

'Gareth'

'aaaaah understandable'
by viklapoop April 10, 2010
 
5.
a sweet and talented guy, usually a musician, and a friend to all.
1. Did you see that band last night? Their bassist was a Gareth!

2. Do you know Gareth?
Everybody knows Gareth!!!
by secretively February 24, 2010
 
6.
A word used to describe someone whose very purpose in life is to contradict others.

A Gareth is never happy without an argument and will purposely anger/upset others in order to get his quick fix of elitism.

As a group they often roam around the streets of Grimsby talking about cameras and XBox 360's in small groups.
"Hey dude, Stop being such a Gareth."

Person 1: No Your MOM!
Person 2: Why be such a Gareth about it?

by Minty Mouth November 17, 2008
 
7.
He is very shy and likes to keep himself to himself but is a lovely friend. He is very creative on the computer. He is quite quiet but when you want him to contribute, he will do it without a doubt. He makes people smile with his natural funniness. You either love him or hate him- if you hate him you are stupid.
"Who's that dude in the corner? He seems quiet..."
"Oh, that's Gareth... he's a cool dude."
by anontothemazxxx October 15, 2011