The repressed state of feeling limited by the (often illogical) mores of
society into which most people (
Americans, at least) seem to enter as they transition toward
adulthood. The transition is a gradual process, with the most strongly unaccepted practices (such as
public nudity) being eliminated first, but is rarely fully realized until after
college when people seem to feel obliged to start "
acting like grown-ups". Generally, this means forgetting
how to have a good time.
Of course, not everyone falls into this trap. As with all generalizations, there are exceptions.