Gypsy brewers... brewers without a home. These guys are the ultimate beer pirates, they spend all their time dreaming up great beers and then hi-jack some other brewery with spare capacity to whip up their recipes. Smart we recon. See the definition from Wikipedia below.
Gypsy brewery - Wikipedia
A gypsy brewery does not have its own equipment or premises; it operates on a temporary or itinerant basis out of the facilities of another brewery, generally making "one-off" special occasion beers. The term may refer to the brewmaster, or to the brand of beer. The trend of gypsy brewing spread early in Scandinavia. Their beers, and collaborations later spread to America and Australia. Gypsy brewers typically use facilities of larger makers with excess capacity. Often, their beers are made with herbs, spices, and fruits, use experimental styles, are high in alcohol, or are aged in old wine or liquor barrels.
Prominent examples include Pretty Things, Stillwater Artisanal Ales, Gunbarrel Brewing Company, Mikkeller and Evil Twin. For example, the "legendary" One of Mikeller's founders, Mikkel Borg Bjergsø, has travelled around the world between 2006 and 2010, brewing more than 200 different beers at other breweries.