Three comments (plus one):

1). I’m literal (and mostly honest) so I’m disappointed that only 77% of respondents think that HUO means Home Use Only. I’m in the camp that says if you haven’t owned it since it was in a box, you don’t know whether or not it’s home use only. And if it’s been to a show, you know it’s NOT.

2). Different sellers will use the term differently. Some mean it literally. Some stretch the truth. Some undoubtedly lie outright.

3). Anyone who pays a premium for a machine simply because it is described as HUO is a fool.

And one bonus: My favorite has to be “Possible HUO”. Literally true of any machine the seller hasn’t seen played on location.