Top Definition
Stands for "illegal, immoral, unhealthy, unsafe." Applies to a lot of things. Used by several youth groups as a mantra or a sign of solidarity or pledging. You'll often see graffiti of it in rough urban areas. Pronounced double I double U.
"Anything IIUU
Is something I will never do
Because it hurts me
And it hurts you"
by shard April 15, 2005

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