In this Passage what is the meaning of "scoffing his granola" sentence: He’s a terrible time keeper. We go on and on at the kids about time keeping but the Head’s late for everything. The assembly hall is full and he’s still scoffing his granola.
"Scoffing" means "eating" and implies a greedy, rushed action. Granola is a breakfast cereal mix. The Head is late for the first assembly because he's still greedily stuffing cereal into his mouth. If we presume that "we" are the teachers who follow the Head's strict timekeeping orders then the use of "scoffing" takes on a perjorative slight.
Even with his breakfast (scoffing his granola) he is late and in a hurry!
To eat (food) quickly.