Comments to keep people off my bump?

Does anyone have any witty or really any kind of comment/ phrase to keep people from touching your bump? I'm fine with my husband and mother in law touching me (although they never do out of respect to me unless I say baby is kicking and ask if they want to feel) a coworker of mine doesn't get it no matter what. Now I could completely go off on her... but I need this job XD when I have physical prevented her from being able to touch me (arms and hands protectively covering my bump) she made a comment how I was going to be "one of those moms" who don't "allow people to touch their babies". Tbh yes I will unless they have my permission. Ugh it's frustrating!! Any advice?