Cochonnet is a French word that is used to call the little ball that is used in the French sport "Pétanque". The goal of Pétanque is to throw heavy iron balls closest to le "cochonnet". In slang, we use it to call the part of the body between the vagina and the anus, because this is where the balls hit.
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.