I’ve heard “flipping” used in real-life speech in Leftpondia. It’s not rare, but it is somewhat uncommon. In my opinion, it is a ‘goofy’ euphemism likely to be chosen by those who might just as easily use “gosh-darn” or “dad-gummit”. It seems to me to be slightly less ‘goofy’ than either of those.
“Fricking” and “effing” are, in my experience, more commonplace. I have heard the actual “F” word and its variations far more often than either of these, though. As NTG says, “...there’s barely a stigma associated with dropping an F-bomb or twenty nowadays...”