\npython -c "print '*shun*\\n'*50"\n
Not a one-liner, but fewer characters to type overall (and slightly different output, but still shunful):
[~]$ python
Python 2.0 (#1, May 16 2001, 00:02:45)
[GCC 2.95.3 20010315 (SuSE)] on linux2
Type "copyright", "credits" or "license" for more information.
>>> '*shun* ' * 50
'*shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* *shun* '
Oh, BTW: *shun*