(usually in the phrase 'go off the deep end') Extremely angry.
I told him that I'd broken the vase, and he went off the deep end.
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(idiomatic, US) Crazy, erratic, or irrational.
It used to be a funny comic, but lately it has gone off the deep end.
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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.