Cash flow referring to major cash flow in the thousands, hence the use of the 'K'. Usually refers to someone with a lot of cash flow who is showy about it; therefore, people know this person has K Flow. Term especially used in niteclubs, strip clubs, casinos.
One clubgoer to another: Not only does he have the Flow, he has the K Flow.
Another: Yeah he's always straight to the VIP room with that stack.