Top Definition
UIN
Unique Identification Number.
A number that's unique for each person/user/etcetera. Often used in termes including IM-programs etcetera.
- Hey, what's your ICQ UIN?
- 55566677, you can add me now!
by JennyF13 January 05, 2006
1 more definition
UIN
Unique Identification Number.
A number that's unique for each person/user/etcetera. Often used in termes including IM-programs etcetera.
- Hey, what's your ICQ UIN?
- 55566677, you can add me now!
by JennyF13 January 04, 2006

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