It was meant as a compliment often given to fiery, go-getter women. If the best a woman could be is calling them a child with qualities comparative to the worst soft-drink ever formulated, is that a good thing? It's like saying "you're full of New Coke" or " You got Pepsi Clear".
#ObsoleteMicroAgressions
Seriously. Has anyone ever tried Moxie? It's weird.