From the merger of the words crap and spectacular:
adj. - Of the
nature of being particularly bad or undesirable
n. -
Something that is craptacular as a particularly bad
moment, event, or instance.
My
car broke down, I was late to
work, and I got yelled at by my
boss. It was a craptacular morning.
The party was dull and had bad music. It was craptacular.