and I have never heard what a biffle is , but it doesn't matter - here's what you need to know:
It's ___ o'clock is a playful way (joking way) to say: 'It is time to/for ____'.
"It is time to eat an orange!" <--- a playful way to say, "I will eat an orange now"
"It is orange o'clock" <--- a very silly way to say " IT is time to eat an orange".
Imagine that on the face of a clock, instead of 12,1,2,3,4, there is a picture of an orange.
So, when the clock's hand points to the orange, it is orange o'clock, i.e. time for an orange. !