is the German definition of unbelievable or unconceivable. He uses this term when he is breathtaken, speechless and in awe of a singer’s performance. An english translation would be something along the lines of “unfuckingbelievable”.
A term created by Rea Garvey (Irish sing-songwriter) as one of the coaches during the Voice of Germany (2012). “Unfassbar”
Wow – your voice is “unfuckingfassbar”, meaning it is incredibly good – it blew me away.