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A fish (especially trout) which has very poor condition, often characterised by big head, long body and very narrow width across back/shoulders.

someone who needs to harden the fuck up, or just a person whos being annoying/frustrating.
'God, thats a slabby dog of a fish mate'

'Did you hear?' his not coming drinking tonight..
what a slabby dog
by ling_ling March 24, 2010
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