one-thumbing
n.— «In the stop and go traffic, I counted 14 people, nine men and five women, clearly checking their e-mail or trying to communicate via their mobile phones. It’s become so common among the wired work set that there’s even a term for it: “One thumbing.”» —“Texting while driving is reckless” by Mike Wendland Detroit Free Press (Michigan) Aug. 16, 2007. (source: Double-Tongued Dictionary)