What does AUO mean?
I don't know
Other definitions of AUO:
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How to use the term AUO:
There are no example uses of AUO at this time. We would greatly appreciate your contribution if you would like to submit your own!
More slang terms:

XBF
Ex-Boyfriend

IFWIS
I forgot what I said

AVIE
Avatar

UKT
You Know That