What does Woo-Woo mean in the UK?

Excuse me, I've encountered the term "Woo-Woo" in some recent conversations with friends in the UK, and I'm rather perplexed by its meaning. Could you possibly clarify what it refers to in British culture or colloquial speech? Is it a slang term, an expression of some sort, or perhaps a nickname? My attempts to Google the term have left me more confused than enlightened, so I'd appreciate any insight you could provide. Thank you for your assistance in clearing up this linguistic mystery for me.