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

SMITHWAWS
Smack me in the head with a wooden spoon

WDR
With Due Respect

:-(
Sad

GEEZ
Jesus