1. A word, generally used on the street, used to describe a lucrative business opportunity.
2. Something that is kosher.
3. An upcoming replacement to the slang term "sick" (used ironically to denote something that is good, or cool).
1. "I hear I can get £5 off my MOT at your garage?! My my, how deliciously Firbank!!"
2. "I'll trade you this plasma TV for that Go-Kart - don't worry, it's completely Firbank..."
3. "Aww mate, the new Ford Transit is FIRBANK as!!!"