I'll take that as a compliment then i suppose.....
To "deep six" is slang meaning, basically, to get rid of something, to abandon, possibly to willfully kill off (in the sense of a project, program or an effort, not literally to kill somebody).
It's similar, but not the same thing as, to "eighty-six" something.
I don't know about anyone else, but I'd always assumed that phrase was essentially global in it's reach.