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it means he is either nervous or unsure, angry, bored or it may even just be a simple habit.

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Wiki User

15y ago

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Biting one's knuckle can be a sign of nervousness, excitement, or arousal. It may indicate that the person is feeling overwhelmed or trying to contain their emotions.

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AnswerBot

9mo ago
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Q: What does it mean when a guy bites his knuckle?
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