(名詞) 經常低頭滑手機或低頭看類似裝置所造成的上背部弓起。這個字是由 iPhone (iPad, iPod, etc.) + hunch (背部隆起) 拼綴而成。
iHunch (動詞):(經常低頭滑手機或低頭看類似裝置而) 上背部弓起。
iHunching (動名詞/現在分詞)

Or how about something you can use in a variety of positions so you can avoid that iHunch altogether?…
—Glenn Hart, “glennzb’s Gadget Gift Guide (Volume II),” Newstalk ZB, November 25, 2015

If you’re in a public place, look around: How many people are hunching over a phone? Technology is transforming how we hold ourselves, contorting our bodies into what the New Zealand physiotherapist Steve August calls the iHunch….

How else might iHunching influence our feelings and behaviors?
—Amy Cuddy, “Your iPhone Is Ruining Your Posture — and Your Mood,” The New York Times, December 12, 2015