An internet simplification of the phrase, "I know right," due to the misinterpretation of the words spoken with haste.
Better known as, "The rock of knowing" with the suffix of "-ite" that resembles the names of stones. (i.e. Labradorite, Malachite, Granite, Angelite, Azurite, etc.)
The ability girls and women have developed to hold several items at once in one hand. The skill has been developed due to the lack of pockets in women's clothing.
I thought she'd need multiple trips to carry her phone, keys, wallet, and Starbucks to her car since she needed the other hand to open the door, but she used her impressive girl grip to carry everything in one hand.