In labs I worked in, when that result was desired, the work order never had anything but "FLOP" scrawled over it. "Flip" may be correct according to some dictionary or another, but I never encountered it in practice.
That's the same as it was in the lab I worked at. "flop" and never "flip".
Maybe it's a Pacific Northwest thing...
For up from the ashes, up from the ashes, grow the roses of success!