It is the amount they are estimating you will burn on an average day with your BMR and exercise or lifestyle factored into the equation. When you use TDEE for weight loss you don't "eat back" your exercise calories the way you would with MFP. The general setting is 20% calorie reduction for weight loss. You are very close to goal though, so 10% may be more appropriate for you. The TDEE will change based on your goals, if your goal is to build muscle and lose fat then you will be allowed more calories.

Do you want to track calories for the rest of your life for maintenance? If not I would recommend you eat intuitively (listen to your body). If necessary you can track at the end of the day to see where you are as far as calories but don't focus your entire day around it. I believe it was JOnathon Bailor from the smarter science of slim who said "calories count, but I don't think you should count them". I guess what I am saying is that you want to create a lifestyle with maintenance, so your routines need to be something you can do for life. I don't know if you have noticed, but in general paleo/primal folks are not fans of putting a lot of focus on food quantity via counting calories. FOOD QUALITY is what it is all about! If you need to count please do so. Just be mindful of making a lifestyle.

I hope this did not offend you because that was not my intention. It is just that getting to know your body is a huge part of what this lifestyle is about. In my experience that becomes cloudy when you live and die by a tracker and food scale.