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der-brain

A mildly derogatory slang term for a stupid or foolish person, derived from the mock-scornful exclamation 'der' (also spelled 'duh') used to imply that something obvious has been missed.

ˈdɜːbɹeɪn119 viewsLast reviewed Jun 29, 2026+ Add a definition
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#1·Apr 28, 2026

A mildly derogatory slang term for a stupid or foolish person, derived from the mock-scornful exclamation 'der' (also spelled 'duh') used to imply that something obvious has been missed. The compound frames the target as someone who responds to everything with a slow, dull 'der'. Largely dated in current use but still comprehensible and occasionally deployed for retro comic effect.

He locked his keys in the car for the second time that month -- total der-brain move.
Origin: From 'der' / 'duh' (mock exclamation of stupidity) + 'brain'; American slang compound. Editorial expansion authored on Slangora (model-assisted, hedged).
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#2·Apr 27, 2026

(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.

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