Rotgut Booze

Rotgut Booze is a catchall term (especially among travelers) for the fermented liquid and more basic brews to the comparatively more expensive Amasec. Indeed, alcohol comes in many shapes and sizes through the Imperium, and most cultures are noted for at least one kind of rotgut.

Source

 * Dark Heresy (1st Edition): Core Rulebook (RPG), pg. 149