Back Door Guests Are Best Sign
Which guest is always the best? 3
I've seen it in decorative panels for applications, it seems like a silly phrase I'm thinking about ...
Only people who are your real friends will enter through the back door. Sellers and all collectors are knocking on the door.
Friend
I think it's about people who feel comfortable using the front door instead of the more formal door. These elves were best friends.
There seems to be a reference to informal people about your visit. It may even refer to an unconventional visit.
That's the decent thing to do, and it should end there.