iSniff
iSniff (noun?): The procedure that occurs when two iPhone owners meet and swap phones to see what apps. the other has installed. Can be positive or negative depending upon the coolness or lameness of the app. in question. Derived from the behavior of two dogs when they meet.
Jerry iSniffed Bob's phone and howled aloud when he found the "Where's Britney" app. on the home screen of Tony's iPhone.