Definitions include: The feminine version of cowboy up when a woman needs to be tougher, smarter, at the top of her game, to shine in all aspects. Girl you need to Diva Up you have to kill them in that presentation today. It's time to get over it just Diva Up and keep moving.
Definitions include: Expression of disappointment, similar to 'bummer', though more forceful. 'Bummer' tends to be used when something unforeseen and unfortunate occurs. 'Rats', on the other hand tends to be used when you have been making a concerted effort to do something and it suddenly fails. You only use 'rats' about your own misfortune. You can use 'bummer' sympathetically also about someone else's misfortune.