Words like hostage lunch, rabbit choker, vylicious and Obso-word, will simply never be used in any conversation.
As with most Urban Dictionary words, it is made from two words: Obsolete + Word.
Nick :: Great, do you think anyone will actually ever use them in a civil conversation?
Jak :: Uhmmmmm.....
<User "Jak" has signed off>
/Nick/ :: That's what's called an "Obso-word"
"Obso-word" is actually an obso-word itself!