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3.
I.Y.A. is an abbreviation for "In Your Arms".
This may refer to a simple hug or where you'll find yourself after a night with a person.
I wanna wake up I.Y.A.
de Mamoru75 17 mars 2011
 
1.
To greet someone with high enthusiasm and joy. Usally said with a wide grin on face. Pronounced the same as 'Hiya' but without the H.
*Best friend is sighted in town unexpectedly*

' 'iya! Fancy seeing you here, fancy a cup?'
de LauraMcFarlane 3 janvier 2009
 
2.
iya
Shortened way of saying 'Hello'
Comes from Hiya, Hi
Iya Tom!
Hey there Sam!
de Saz464 17 juillet 2006
 
4.
iya
An abbreviation for 'In Your Ass' when someone is looking for something
Man: Yo dude do you know where is my keys?
Man's Friend: Yes dawg they are iya

can also merged with other accronyms. for example:

iyaotl (In Your Ass On The Left)
de Drumy 9 août 2008