boobie covers

I am not sure how it started but instead of calling a bra a bra we reference it as a booby cover. i think it started with breast feeding/pumping but not sure. whenever it started it has stuck. Adler is always calling them booby covers and the other day we were in a woman's store and there was a lingerie section and Adler just starts shouting at the top of her lungs..."BOOBY COVERS, look mom BOOBY COVERS." i just laugh.