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

FTTH
Fibre To The Home

IKHYF
I know how you feel

SOF
smile on face

HDGI
He Doesn't Get It