Wolpertinger, a.k.a. Winged Nut on Acid. Never heard of the rarely seen, Bavarian-indigenous mammal the Wolpertinger? Well, much like the original Wolpertinger, our "Wolpie" is a little Bavarian in nature, scarcely seen and definitely difficult to define...taxonomically speaking. A high ABV, bourbon-barrel aged, chestnut beer fermented with a Bavarian Weissbier yeast strain. ABV: 7.3%, IBU: 35, OG: 18.0