1
general::
Enraged, furious, as in I was hopping mad when they left my name off the list. This expression conjures up an image of jumping up and down with rage. [Colloquial; early 1800s]
American Heritage Idioms
2
general::
Phrase(s): hopping mad
Fig. very angry. • Joe got hopping mad when the salesclerk was rude to him. • The student’s practical jokes made the teacher hopping mad.
McGrawhill's American Idioms And Phrasal Verbs