Top Definition
To let out information that should have been secret.
We just dumped the waste chemicals into the reservoir until we sacked Eddie and he had to bloody go and blow the gaff!
by pidulgi August 20, 2013

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To knock one out on to a piece of cloth - in most cases a hankerchief - roll it up and hide it under the bed covers.
Guy: hey, why you late today? Been waiting for ages...

Friend: Sorry man, had to blow the gaff first.

Guy: Did you wash your hands?
by Crazy Meka September 16, 2009

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt
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