British slang meaning to gossip, blab, or talk loudly and at length about things that aren't your business. To gob off is to let your mouth run without much filter — whether that means spilling someone else's secrets, mouthing off to an authority figure, or just filling dead air with endless chatter. 'Gob' is already British slang for mouth, so 'gobbing off' is essentially the act of letting that mouth run loose.
Don't tell him anything sensitive — he'll gob off to the whole department before you're out the door.
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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.
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(UK, slang) To gossip; to chat idly.
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