Originating in the U.S. Army of WWII, this is the shorthand slogan to describe the hygiene preparation an enlisted soldier must do to ready himself for a military inspection by superiors.
"Shine" refers to the careful and thorough polishing of one's black military boots.
Now it has entered civilian use to mean preparation for any important social event in which one must look good, often abbreviated nowadays to just "shit, shave and shower".
Soldier 1: "We've got an inspection latertoday from the brass."
Soldier 2: "Guess it's time to shit, shave, shower and shine."
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.