What does INGSI mean?
I'm Not Gonna Say It
Other definitions of INGSI:
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How to use the term INGSI:
There are no example uses of INGSI at this time. We would greatly appreciate your contribution if you would like to submit your own!
More slang terms:

LMTCB
Left Message To Call Back

GTFOM
Get The Fuck Off Me

LSHISMP
laughed so hard I s**t my pants

FIRME
Cool, good, nice