I used to completely stop talking and look at the ones talking over me. When they shut up, I would start again. I would also make a comment when opening up the meeting to the effect...."Ladies, please mind our manners. The faster you let me get through this by giving me your attention, the quicker we get to the goodies and show n tell."
I was also ornery. When no one was signing up for quilt show committees, I would circulate the list and tell them that if they hadn't signed up for a committee it meant "put me where you need me".
It's all about presentation! LOL Good Luck!