This can be trimmed down to 90 chars:

  my($a,$b,@r,$c)=@_;for my$i(0..$#$a){$$c[$i+$_]+=$$a[$i]*$$b[$_]for 
+0..$#$b}@r?p($c,@r):$c
[download]

   MeowChow                                   
               s aamecha.s a..a\u$&owag.print

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