FF is for flip-flop.

FF

flip-flop • flĭp-flŏp

     noun

     1. a disconnective unit of time

     verb

     1. to disconnect time

It can mess you up!

Explanation:

Almost all units of time are connective and consecutive. E.g., there are 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day, 7 days in a week, and so on. Today follows yesterday and precedes tomorrow. The flip-flop disconnects time, especially with regard to speech or action that was in time; thus what one did or said yesterday has no connection with one might do or say today; what one does or says today is disconnected from what one might do or say tomorrow. A sufficient number of flip-flops happening in a sufficient number of places on the planet could destroy the linear nature of time for (Western) historians though not for physicists (who already have their own ideas). Fortunately for historians (and for all Westerners in their day-to-day lives), flip-flops are generally confined to state or provincial, and national centers of government.