What do people generally mean whenever you see XXX in a comment.  Occasionally, I'll see a comment like this:

# XXX - This widget really should frobulate the whatsit


Of course, I can tell what the comment means, but what does the XXX generally mean?  Is it saying "This is a hack" or maybe "Perhaps we should revisit this later"?  Or is it saying something else entirely?

What XXX represents, depends on the author of the code. In general, it is used as a marker for code that requires attention.

However, this web page states a somewhat different train of thought:


  XXX : used to flag something that is bogus but works
  
  FIXME : used to flag something that is bogus and broken


I guess this further shows that its meaning is not well defined and is used differently.
