Yo, yo, Ma/I was shook

I don't understand what is "Ma" stands for?

Can you please explain "I was shook" in other words?

Whenever we can't sleep, we listen to the ocean floor. She got a Sound of the Sea CD from me from the Brookstone store and ever since I've been snoring like a... like a really good metaphor for snoring. Sorry, I go blank sometimes. What? I'm 85! I'm not complaining. I'm just happy that I'm still alive and happy that I have my better half by my side, super-fly. She doesn't look a day over 65. When I first saw her, I was totally in awe. She was classical, so I was like, "Yo, yo, Ma." And that was all it took, a single look and I was shook.