The utter destruction of a down pillow or pillows in a confined space, or the evidence thereof. Some pillow fights can result in pillowgeddon, but not all pillowgeddons are the result of a pillow fight.
I placed a beloved goose down bolster pillow handmade for my wife by her long dead aunt in the dryer. When I opened the dryer door after multiple drying cycles I was witness to pillowgeddon.
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.