Top Definition
A nasty knee-jerk attitude, particularly displayed by a woman. On autopilot, but with a bitchy attitude.
She was late to lunch and stuck me with the check so I thought she was calling to apologize, but when I called her back she was on auto-cunt.
by little troll November 30, 2009
1) a mechanic who needlessly charged you too much for a simple repair

2) when you send a text, either a hate filled one to your ex wife, or an obscene joke to a friend and only realise that autocorrect ruined the punchline of massage of hatred making you look an autocunt
Max realised he was an autocunt after he told his wife to "burn in he'll"
by Daphne Widethigh July 27, 2016
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