brainfuck noun 1verb 1forms 3 noun1 •(vulgar) Something that destabilizes, confuses, or manipulates a person's mind.What a brainfuck. Little Roger, my brother, wanted to have a talk about sex. — 2004 verb1 •(vulgar) To destabilize, confuse, or manipulate a person's mind."I don't want to hear that. Don't try and brainfuck me by turning this around and making it some sort of redemption thing. […] — 1999 formsbrainfucked · brainfucking · brainfucks