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1.
YIW
You isn't wrong!

Ohmage: That guy knows!
Cronic: YIW
by Ohmage_Cronic April 24, 2009
 
2.
YIW
abbreviation of 'Yes I Would', used to describe or identify a sexually attractive girl.
'cor, did you see that girl just then? YIW
by eyeball paul March 19, 2007