Tic Tac is a term that is used for bookmaker who are trying to express odds with their hands. It was one of the easiest ways that on courses bookies used to be able to inform prices of horses to other bookies in crowded areas.
The strategy is very simple: count how many days, hours, or bars a run-up or a sell-off has transpired.Then on the third, fifth, or seventh bar, look for a bounce in the opposite direction. Too easy? Perhaps, but it's uncanny how often it happens.