Running on my machine with Perl 5.16.3 produces: 

er,ackrl heP Just another

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Changing $|-- to --$| like so: 
sub _{@_<2&&return print@_;my@a;push@{$a[--$|]},$_ for
@_;_(@$_)for@a};_ split//,"huroP cels,tetah Jen akrr";

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produces the required: 
Just another Perl hacker,

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See also: Japhy explains where behaviour of --$| is documented.

Update: To further clarify this mysterious "flip-flop" behavior when $| is --'ed, but not when ++'ed, notice that running: 

perl -le 'print --$| for 1..5'

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produces: 
1
0
1
0
1

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while running: 
perl -le 'print ++$| for 1..5'

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produces: 
1
1
1
1
1

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BTW, this magical --$| flip-flop often produces the shortest Perl golf solutions when you need to flip-flop between two different values in a loop; for example, it was used in Re^2: Mini-Tutorial: Working with Odd/Even Elements and Spending Time on Saving Time [golf].

In reply to Re: $|-- rocks. (Japhy explains where behaviour of --$| is documented) by eyepopslikeamosquito
in thread $|-- rocks. by BenGoldberg

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