Similar to what Protogenoi said, I can also play a game app on my tablet while following a TV show at the same time, but, also similarly, if one or the other gets too involved or too interesting, even, I have to stop one activity and fully pay attention to the one I'm wishing to prioritize.
I find I can multi-task in the sense of giving a kind of fast-switching attention to maybe two activities or points of interest or observation, but if you pile on one more thing I'm losing my cool, getting frustrated, feeling stressed and overloaded, and have to stop ALL of them.
Oddly, the multi-tasking of driving a car came very naturally to me even though that skill is piled high with multi-task demands. It is still stressful but it's do-able. Yet make me have to give focus to more than two things even while sitting still in a quiet room, and I'm not coping well at all.