bite someone's head off

Idioms  

1. Also, snap someone's head off. Scold or speak very angrily to someone, as in Ask her to step down from the board? She'd bite my head off! The first expression, dating from the mid-1900s, replaced the much earlier bite someone's nose off (16th century); the variant was first recorded in 1886.

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Example Sentences

In bounces Sir Lionel, wet as a merman, dripping rivulets at every step, splashing, swashing in his boots, drops dripping from his eyelashes; glares around, looking ready to bite someone's head off without salt or sauce; sees me; brightens with a watery gleam; comes toward me, rather shy and stiff, yet evidently under the influence of—emotion of some sort.

From Project Gutenberg