Said in response to someone saying thanks. Comes from a Joke where David Hasslehoff asks a Clerk to change his name to the Hoff... when the Clerk said Sure, No Hassle. Now instead of saying "No Hassle" people just say Hoff.
Went quickly or went unencumbered. May have to do without the old idea of having an account or owing money... having a slate, and maybe this the idea of being free from debt...