snap head off
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snap (one's) head off
To respond to someone with anger that is often sudden or unprovoked. What's wrong with the boss today? I just tried to ask him a question, and he totally snapped my head off!
snap someone's head off
Fig. to speak very sharply to someone. (Based on snap at someone.) How rude! Don't snap my head off! Mary snapped Ted's head off because he had come in late.