Liz, It took me a moment also to get the abbreviation. I believe the reference is to "Shut The F--- up"! Bxcall1, Surely you made that post in jest. If my interpretation is correct of the initials you used, I could never imagine being told such a thing in a work environment. Personally, I would be totally and completely offended by such a comment. Perhaps you could try the suggestions of some of the previous posts and have a key phrase or a hand movement or something of the sort.