It means that a reserved area of memory, called the stack, was forced to overflow by line 33 of a program -- I would suspect a java program is causing this error message. There's no guarantee the message is accurate. It is not a Mac message necessarily although it could be. This typically happens when too many operations use the stack space without resetting the memory they use when they are done.

If your system doesn't hang on it, the message is probably bogus, I would say at a guess, and you can happily ignore it.

A