noun British and Australian Informal.
aggressiveness, especially that of an urban youth gang or gang member.
trouble; irritation.

1965–70; construed as a shortening of either aggravation or aggression (or aggressive); see -o Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aggro (ˈæɡrəʊ)
slang (Brit) aggressive behaviour, esp by youths in a gang
[C20: from aggravation]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
He looked for something in their faces: crankiness, aggro, badness.
Aggro aggressive or confrontational behaviour, extreme irritation or exasperation.
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