What does O/O mean?
High five
Other definitions of O/O:
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How to use the term O/O:
There are no example uses of O/O at this time. We would greatly appreciate your contribution if you would like to submit your own!
More slang terms:

CRAT
A hairless cat therefore it looks like a mix of a cat and a rat

UTFL
Use The Force, Luke

IMBA
Imbalanced

E2EG
ear to ear grin