Poissonnière : nf A fishmonger is a woman who does the trade du fish. For a man, it is the fishmonger.
In the figurative sense and insult: Rude woman with manners similar to the one who tries to sell her fish, that is to say to activate by shouting, alpagant, interrupting, hailing, gesturing, etc.
See as well Poissonnière under Kitchen vocabulary and utensils