When one is "on the flip flop", they have deliberately misinformed another individual and then, after creating a sufficient confusion, owned up to their machinations to the visible disappointment of their victim.
simplified:
changing your mind
-monikasaid one thing and did another
-well i guess shes on the flip flop
A phrase coined during the 1960s and 1970s trucker Citizen's Band (CB) culture. It literally means "I'll contact you on the return trip." If two long-haul truck drivers regularly make opposing trips, their path will eventually meet on each iteration of the trip. This term is virtually interchangeable with catch you on the flip side.
...we're gonna back on out of here. So, keep the bugs off your glass and the bears off your tail. We'll catch you on the flip flop. This here's the Rubber Duck on the side. We gone. Bye bye.
The "flip side" is the reverse side of a vinyl record, a term often used by radio DJs. They might say "I'll catch you on the flip side" to mean they will let a particular album play through, and won't start talking again until they have to change or flip records.
"flip flop" is a variant used originally by truckers to mean a U-turn or the return trip, and may be used instead of "flip side."
Catch you on the flip side. I'm a little beat for my doss, so I gotta gofloat some zees.