Green’s Dictionary of Slang

flurry n.

[McDonald’s McFlurry ice cream]

(Aus.) a promiscuous young woman.

[Aus]Sydney Morning Herald (Aus.) 6 Jan. n.p.: So here’s a tentative guide to Sydney teenspeak: [...] A flurry (a girl perceived to be easy, from McDonald’s Mcflurry ice-cream. Heaven knows why).