To become boyfriend and girlfriend or to become an "item."
Hey babe, Do you want to itemize so I can call you my girlfriend?
a couple; someone who is perceived as belonging to their partner
Mr Mac and Miss Cheese are an item.
pair of poeple, commonly seen as dating, or about to date.
So, are you and Amanda an item?
American-Syrian Jewish Slang used to refer to anything you may forget the name of
Jeff: Where is the Item tonight
Sam: At Marlene's House
Ray: Dude don't touch my items!
Charles: SORRY! It was an accident