(Pron. "bawl-zee thing-king")

defined:
adj: 1. Slang courageous and spirited reasoning; judgement  2. Characterized by clear, straightforward thought or thoughtfulness; rational: “That’s the sort of Ballsy Thinking to move us towards our objective”.

n.  1. The act or practice of one that thinks differently, innovatively; new thought.  2. Leading by way of reasoning; judgment: “This is not ballsy thinking, it is too timid an idea.”