The act of typing with only your thumbs on all typing devices, I.e. Computer keyboards and other devices through the learned behavior of texting on smaller devices such as cell phones.
Jason thumbled out his term papers on his computer keyboard to the amazement of his parents. "Mom, where are the bandaids? My thumbs are sore from thumbling!"
This is for the co-worker that helps with everything. He is organized, efficient and he is a good little bitch. He is a princess that goes the extra mile. He is also the one that can call in drunk to work and looks at naughty porn while on the clock. These are the kind of workers that we need in America. MORE THUMBELINAS!
Robert: Hey Doc, after I have been texting for 3 or 4 hours, my thumbs cramp up and I can hardly move them.
Dr: it sounds like you have thumbilitis, you may not be able to text for a while!
Robert: Can I get a work note for that?