Wiktionary
hopping mad
a. (context idiomatic English) Extremely angry; furious to the point of outburst.
Usage examples of "hopping mad".
I'm hopping mad about it, to the point that I want to commit an act of free speech against him.
There are a whole bunch of grounded tangos down there right now, hopping mad.
Her driver was out of the motorcar, hopping mad and yelling at a U.
You will remember that there was nothing sub rosa about Gregori's arrival in this country -- it sparked off a minor international crisis, the Italians being hopping mad that one of their top-notch bio-chemists should turn his back on his own country and go to work in Britain.
Percy was by this time hopping mad, and I knew I had spoiled his supper and probably his whole evening.