Idiot/Savant’s comment on the origin of the phrase “Dead Dog” prompted me to do a quick online search to see what I could find out.
First of all, Urbandictionary.com had two definitions for “dead dog” – both of which were “a dog that is not alive.” Will someone please explain to me why someone thinks that is slang.
I gave both entries a thumbs down.
Dead-dog, with the hyphen, was defined as some kind of modifier that means “very” as in “dead-dog tired”. I’ve heard of “dog tired”. Maybe they’re related.
Searching on google was thoroughly unpleasant, but I did spot the term on Wikipedia’s entry on science fiction conventions. It mentions dead dog parties that happen at the end of the convention, which allow tired con-goers to unwind. I guess they’re all dead-dog tired by that point?
So now it’s been borrowed over from sci-fi con slang into LARP slang to mean the event at the end… though I find LARP Dead Dogs to usually be pretty animated.