German doesn't simply adopt english words but uses English word-stems to build things that don't exist in English. Handy for mobilephone, beamer for projector. We also kind of like our shitstorm: https://en.wikipedia.org/wiki/Shitstorm
The first entry for shitstorm on urban dictionary is from 2003. Way before it became popular in the German media.
Germans do use the word 'handy' when referring to a mobile phone.
To us, 'handy' sounds like it could be the actual English word for mobile phone. When we hear 'public viewing' we think of people watching soccer together outdoor on a big screen. And I guess that most of us first think of a laptop computer when we hear the word 'notebook'.
Shitstorm is definitely an English word though. Handy and beamer are both English words as well (so many words), although I doubt one would confuse projector technology with cricket terms!