What does UIN mean?

Unique Identification Number

UIN

Other definitions of UIN:

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How to use the term
UIN:

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More slang terms:

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ROFLMGAO

rolling on the floor laughing my gay a** off

FIFO

FIFO

First In First Out

SSDP

SSDP

same s**t different pile

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A slang portmanteau of Chicago and Iraq, likening the city to a war zone because of high crime and murder rates.