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To hit, strike, or beat something vigorously with a stick. Usually while very upset or disappointed. But, it must be with a stick, or else it's not anundering.
Amber went to chemistry class and realized there was a test she forgot to study for. She was so angry, she wanted to anunder somebody.

After my best friend told me I was ugly, I wanted to do some serious anundering.
by anagr7 January 12, 2011
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