2020

• Captain Rumsey's Lager
• Item Level 1Disenchants into:
  Not disenchantable
• Use: Makes you slightly tipsy and increases your skill in fishing by 10 for 3 min.
• 1 (Expendable) Charges
• Sell Price: 50 (each)

Not sure how being intoxicated can help your fishing skill...but as Nat Pagle says, "Fishing is a great excuse to drink."

Source

Made in stacks of 5 by cooking for those who have learned  [Recipe: Captain Rumsey's Lager].

Notes

• Fishing buff stacks with a lure.
• The components of this drink are sold by Sarah Brady in Dalaran and Kylene in World's End Tavern, Shattrath City.

Patch Changes

• Patch 2.4.0 (25-Mar-2008): Added. 
  

External links

• Battle.net (EU)
• Wowhead
• Thottbot
• WoWDB