/hop"ing/ , adj.
1. working energetically; busily engaged: He kept the staff hopping in order to get the report finished.
2. going from one place or situation to another of a similar specified type (usually used in combination): restaurant-hopping.
3. hopping mad , furious; enraged: He was hopping mad when his daughter dropped out of college.
[ 1665-75; HOP 1 + -ING 2 ]