I'm not sure I've heard anyone pronounce it, but I always read it as "FS check". Anything else (except maybe f.s.c.k.) would have me staring at you very confuse

I'm not sure I've heard anyone pronounce it, but I always read it as "FS check". Anything else (except maybe f.s.c.k.) would have me staring at you very confusedly trying to figure out what you're talking about.