Deschissen

A decision that has been made and that is retrospectively perceived as very disadvantageous, or "beschissen". It is a portmanteau word and is composed of the English word "decision" and the German word "beschissen" which means crappy. Because of the similar tonality, a fusion of these words lends itself to expressing one's own regret about a decision made in the past in one word with an acoustic shortcut, so to speak.