MCT is Medium Chain Triglyceride, it is an oil that is essentially the good stuff from coconut oil, but for me, it mixes much better in my hot and cold liquids (I use a stick blender). It is also a totally flavorless oil. I started using it when I started doing Bullet Proof Coffee.
I use cream/butter/oil in my afternoon teas when I see that I am falling short on fat. I skip it if my fat percentages are looking good. I personally don't eat much meat and what I do is high fat sources. Since you are on MFP, you may want to check other people's diaries who are on this thread and see how they work out their macros, the kinds of meats they eat, etc to get ideas.