Since I work with customers I have to temper my sailor mouth while I’m at work, so I have to say all sort of almost-swears instead. Flipping is probably my favourite at the minute, as in: flipping hell. But I have also used blimey a lot recently as well, one that i’d never thought I’d ever use regularly. One of my coworkers actually says “FFS” which I always think is pretty cringe but nobody’s cottoned on yet as far as I know.