Top Definition
AAU
Amateur Athletics Union. Basically an extra league for most sports such as basketball, baseball, and other sports. Usually for really good players that are trying to get looked at by scouts. AAU teams enter different tournaments for their sport and at least for basketball, enter showcases.
I play AAU basketball and entered the Hardwood Classic.

I play AAU baseball, which isnt as fun as basketball.
by kobeshitsonlebron May 20, 2008

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