Ask HN: Can someone explain what “doug1izaerwt3” is?

I found this stub of code on a website:

<script type="text/javascript"> var _kmq = _kmq || []; var _kmk = _kmk || '<something here>'; function _kms(u){ setTimeout(function(){ var d = document, f = d.getElementsByTagName('script')[0], s = d.createElement('script'); s.type = 'text/javascript'; s.async = true; s.src = u; f.parentNode.insertBefore(s, f); }, 1); } _kms('//i.kissmetrics.com/i.js'); _kms('//doug1izaerwt3.cloudfront.net/' + _kmk + '.1.js'); </script>

I understand most of it, but not the "doug1izaerwt3" part.

Can someone throw some light on this? TiA.