What is the meaning of the slang term word?

Definition of the slang term "Word"Word: It is short for saying "you have my Word". Instead of saying "you have my Word" you simply say "Word."

For example: "I did not check out that girl. You have my Word." instead you would say, "I did not check out that girl. Word."

It is the absolute truth, the authoritative Word. "What you are saying is absolutely true."