(British, NZ, Australia) A solid putty-like adhesive, originally blue in colour, used to secure items to walls and other surfaces.
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(British, NZ, Australia) To fix with Blu-Tack.
The power switch wasn't seated properly, and so I blu-tacked it into place.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.