Green’s Dictionary of Slang

co-op adj.

(Aus.) co-operative, accomodating.

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[Aus]Benjamin & Pearl Limericks Down Under 79: She enjoyed a good drop / And was very co-op / With locals like Tom, Dick and Jerry.

In compounds

Co-Op mix (n.)

(Irish/Scot.) a homemade bomb using materials that can be bought in high street stores.

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[Scot]A. Parks April Dead 7: ‘Called Co-op mix because you can get most of the ingredients for it in your local Co-op. Simple to make and pretty effective. Standard UDA and IRA stuff’.