The oily residue that accumulates on the screens of touch-sensitive phones such as iPhone and other devices, caused by the repeated transfer of oils via finger contact.
After a few days of use, my iPhone screen is completely covered in iGrease and I have to clean it with Windex.
When twoiPhone users get into a conversation about the apps and features of their iPhones. This can sometimes lead to one-upping each other on who has the cooler app. Individuals iGeeking often become oblivious to the boredom of other observers.