The days following a holiday or a long break from work and/or school where a person stays up late, eats a lot and generally rolls out of bed at noon. These days feel like Sundays, hence they are interminable.
The days following New Years Eve always feel like an Interminable Sunday.
The type of person who continually talks about the amount of snow your area is expected to get, often complaining or acting fearful several days before it will happen. Will refer to anything more than 2 inches as a "Snowpocalyspe" or "Snowmaggedon".
Victor: "Did you hear Amy carry on about how its supposed to snow all weekend?"
Lisa: "Yeah, she is a real Snowstradamus. Its really getting old."