Host ghost 

A specific type of ghost in a chatroom or other communication service who appears yet present, while in fact already gone, as a result or side effect of a host error. Many services offer a command to erase them from the list of people present as well as other type of ghosts, such as NickServ's /ns ghost.

I have spent a few minutes to write a private message to a host ghost until I realized they have disconnected before I began.

Host ghost by SuddenTL March 20, 2015

Ghost Host 

When you can't host a party/event/game yourself but offer to pay for all or some of the supplies.

Adam: "Hey guys, sorry, I can't host the poker game next week. I'll ghost host though & pay for the beer"

Ghost Host by JC McJeezy October 16, 2012

G-host 

Game-host who is invisible (doesn't play)

I got a bone to pick with the host! Where is he I need to talk to him!
you can't he's a g-host

G-host by GRATZD February 21, 2011