Urban Dictionary: UIN

2.	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! buy uin mugs & shirts icq number unique number user number contact number identification by JennyF13 Jan 4, 2006 add a video
1.	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! buy uin mugs & shirts icq number unique number user number contact number identification by JennyF13 Jan 5, 2006 add a video