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1.
IAR
In a relationship. Used especially to mean claims of being in a relationship on an online social networking web site such as Facebook.
"I just noticed on Facebook that Emma is IAR now."

"James claims to be IAR, but I think he has a Canadian girlfriend."
by Michael in Cambridge November 02, 2007
 
2.
iar
Abbreviation for "In a round..."
Airborne Ribbon
Requirements:
* IAR: 10 seconds in a Parachute
--(Battlefield 2)
by Bankai December 17, 2005
 
3.
"In A Relationship"
Used in a sentence :

"OMGZ, are we I.A.R?
by joshua eric March 16, 2007
 
4.
iar
two inches inside kevin bacon's anus
i finally got to third base, he let me touch his iar
by koolaidkid April 08, 2004