What is that on my arm?

So I cooked a big pot of beef-a-roni tonight for dinner. I wanted a big glass of cold milk to go with it BUT when I went to the fridge and got it out, it was out of date!! To me there is nothing like a big glass of COLD milk with spaghetti!! Mali was in her bouncy seat on the kitchen table right in front of me eating her baby food (mac n cheese) . I was talking to my sister Mariah via SKYPE, while we were having dinner. As I was eating my dinner, something from Mali's way landed on my arm. I just wiped it off, as any mother would do and took another bite of my beef-a-roni. Then I looked up to give Mali another bite and her bottom end had EXPLODED all over her and her bouncy seat. THEN it hit me.............. it was flying Mali poo that had hit my arm!!! Mariah informed me that I probably shouldnt eat anymore from that plate, maybe I should fix me another!!! SO I gave Mali her bath and washed my hands and arm...... and fixed myself another plate :)