Definition

An archaic interjection meaning "in truth" or "indeed," now used exclusively by Shakespeare enthusiasts, Dungeons & Dragons players, and people being deliberately pretentious. It's the medieval equivalent of saying "no cap."

Example Usage

Forsooth! The tavern serves a most excellent craft IPA!

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=forsooth&defid=20694)