Late 80's early 90's term...in the bible it is said not to swear, let your word be your bond..hence word is bond; this was at first used by
members of the 5 Percent Nation AkA 5%ers. ( Asbury Park/Long Branch NJ)
Saying this means that what you are saying is absolutely correct, and you do not have to put up money to prove it, you just say it. The term originates from the financial markets where hirstorically traders woul tell each other "my word is bond", i.e. my word is good enough, you don't need it in writing