Hey what's up everyone this is my first build and I'm making it for gragas so any feedbacks is always appreciated, votes aswell as long as you comment on it. Thank you :). First of all this build is meant to be played in 5v5s but is also very viable in 3v3s. You just need to make some adjustments along the way, and for 3v3s I don't really suggest atmas. You're better off with Frozen Mallet!

Pros:
¢Lots of HP
¢Great Harrasser early game
¢Great escape mechanism (Go through walls and such)
¢His ultimate is really great
¢Pretty frickin sexy

Cons:
¢He's a meat tank
¢No real dps
¢No lady gragas skin
¢He just gets crazy when theres no beer left

Runes are pretty simple,
Marks of fortitude x9
Seals of VitalityGreater Seal of Vitalityx9
Glyphs of Focus x9
Flat HP quints x3.

For Masteries I went 9-21-0.
Enough offense for harrassing with barrel roll (Archaic Knowledge).
Rest in defense for more survivability.

Ok so for the items I start off with Mana Manipulator
On your first trip to town you should have enough gold to buy Mercury's Treads
After that just keep farming, until you can buy Soul Shroud
When that's out of the way get a Glacial Shroud
You should be pretty much capped with CD Reduction if I'm not mistaken.
So now you want some more hp and Warmog's gives you that, start by buying a giant's belt once you got that it's pretty easy to get the rest.
When you have your warmog's finished, it's really up to you to take either Frozen Mallet or Rylai's Crystal Scepter first.
Now is the time to get Atma's Impaler

For the skill sequence, DO A BARREL ROLL!
then get drunk and mad
after that just jump face first into combat
if someone runs away make him come back to you!

Skill sequence for escaping,
just use body slam to get away from the ennemies and don't forget to use it to get through walls!
keep explosive cask if necessary, it can really save your *** when they try and gank you.

Cleanse for CC obviously... and flash to either chase or escape...

That's about it for my first guide on Gragas. I hope you enjoy it, comments are appreciated, good or bads.