Izzard's Ever Flavor

Izzard's Ever Flavor is the February brew from the Brew of the Month Club.

Source
This is only available to members of the Brew of the Month Club, which can only be joined during Brewfest.

All members of the Club get free sample of the brew in their in-game mail at start of February. Should you want more, your local Brew of the Month Club Brew Vendor sells it in stacks of six till the end of February.

On the first of February, members receive the following in game mail:

Effects
Like any weak alcohol, this makes you slightly drunk. Also, like all Brew of the Month brews, drinking one of these will create a Empty Brew Bottle that can be targeted and thrown.

Special effect of this brew is chance to get "Gassy: There's no polite way to end this" buff for 5 min. While the buff is up, your character will breathe green smoke, and removing the buff causes a massive burst of green smoke.

If the buff is allowed to run its full course, any players or npcs in close proximity to the drinker gains the buff(debuff?) "Potent Stench: Your nostrils have been assaulted" for 20 seconds.