A satisfying insult for someone acting foolish, dim-witted, or spectacularly clueless. The 'dill' part echoes Australian and British slang where 'dill' itself means an idiot, and 'brain' adds that delicious irony — suggesting a brain that's about as useful as a sprig of herb. It's the kind of mild-but-pointed insult you'd hurl at someone who just did something monumentally silly, more exasperated than genuinely mean.
You absolute dillbrain — you forgot the tickets after we reminded you three times.
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(slang, derogatory) A fool.
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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.