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  1. Desperate.
  2. From the racing term 'Champing at the bit' meaning a horse is desperate to get going.

Haw big man, gonny gees a fag? Ah've just din a three night lie in and am feckin champin fur a smoke.
Excuse me, could you spare me a cigarette? I have just spent three nights in Police custody and I am gasping for a cigarette.