A general term for somthing bad or unfortunate. Can be used on its own, or to affix or prefix any word, depending on context.
In the Eurovision Song Contest a particularty bad entry will be awarded Nil Pwa by Spain.
Sam: I nearly crashed my car yesterday.
Dan: Oh! Nil-pwa driving skills Sam!
Example Two: Affix
Dan: I hate librarians.
Sam: Indeed, Dan, librarians nil-pwa!
Example Three: Word in its self
Dan: This pint is off.
Sam: (tastes beer) Nil-pwa!