DOOM

As Von Zobel was watching me taking a 10 minute stress management break, chasing monsters with a shotgun, I remember a little anecdote I had to tell him.

DOOM-II was quite a popular game when I was about 8; I played it on my uncle's computer when I access to it was granted to me :) and I knew a few more kids who played it too. However, we all were in groups learning English as the second language, we were of course interested in understanding the name of the game - but we could not.
Because none of the dictionaries we could get our hands on had the word.
I can't remember what the deal was with the English-speaking adults around, the teachers of English or IT in school, but the fact was - we could not dig up the word anywhere.
So then we decided, that the word "DOOM" must be made up specifically for this game (yep, because if something is not in a dictionary for school-aged kids it simply does not exist!), and - that it is a combination of the words DOor and roOM (because you have to move through corridors between all sorts of rooms with monsters, and open all sorts of doors!).
Makes perfect sense, right?

...It was in a couple of years when either my best friend got a computer WITH internet connection, or I inherited a huge Oxford English dictionary from ex-owners of our new apartment, or we got one of our computers in computer lab hooked up to Internet at school... that we did at some point look up the word.
The meaning was definite, but somewhat disappointing.