Okay so I didn't get it at first. Had to look it up. Then I got it. MMT stands for "makes me think".
I found this cute little site with short stories that "makes me think" or, as I would put it, "makes zense":
Today, on my birthday, on my last delivery of the night, I delivered a pizza to one of our regular customers. When he opened the door, he threw confetti, grabbed the pizzas, and said, “Jason, you’ve been delivering my pizzas for two years now and they’re always hot and delicious! Your co-worker told me I would be your final delivery this evening, because you’re taking the rest of the night off to celebrate your birthday. Happy birthday! Have some fun on me this evening.” And then he handed me a $100 tip. MMT (makes me think)
Jan 8, 2012 by jason
Today, it’s been exactly six months since I took on the responsibility of caring for my 17-year-old severely autistic brother. He rarely talks and prefers to be alone. Today while I served him his favorite meal for dinner, he gave me a huge hug out of the blue and said, “Thank you my beautiful big sister!” His gesture made me cry from joy and MMT.
Jan 8, 2012 by allybates