And what, pray tell, is...

Pfiff? Well, it literally translates from German as whistle, but it's more appropriately an onomatopoeia for the sound of opening a beer bottle. For example, take the slogan for my family's hometown brewery: Darmstädter Privatbrauerei - Das Bier mit Pfiff! Dorky, yes, but quite fun to say. And not as rude sounding as Plopp.