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

UKWIS
You know what I'm saying

JUJU
Magic, luck

RWYS
Reap What You Sow

1D
One Direction (band)