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

H8U
I Hate You

FN
Fine

AYTMTB
And you're telling me this because

TOBG
This Oughta Be Good