Top Definition
Denoting or relating to an attack made by one's own side that accidentally harms one's own forces.
The only thing more accurate than incoming enemy fire, is incoming friendly fire.
by caxwl July 08, 2004

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Jargon used by police (blue) to indicate they are firing a weapon and that other officers should take care to avoid getting caught in the crossfire. In the 911 call transcript of the Tiger attack at the San Francisco zoo, an officer was heard announcing a "Blue on blue".
Officer is firing, blue on blue!
by Gorn Dog January 15, 2008

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt