Derived from the slang 'bait', a person of questionable judgement; a liability and embarrasment to others around him.
Thus, 'Baitster' refers to an individual who has consistently exhibited 'baitness', ergo, 'baitster'.
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.