English · Slang Attested 18+

fuckbrain

In real, traceable use. Part of the curated seed collection; community review is coming.

Meaning · English

An extremely stupid person, especially one who causes harm.

⚠ Register: derogatory, offensive, slang, vulgar

Where it’s used: Used American English

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).

Common questions

What does “fuckbrain” mean?

An extremely stupid person, especially one who causes harm.

Is “fuckbrain” formal or informal?

fuckbrain is generally derogatory, offensive, slang, vulgar.

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