Top Definition
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!!!"
by 4WD February 04, 2010

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