Slang term used by people located in North of Mexico to describe something that is really cool, great, or awesome. Something incredible and you can believe it exists. The word in English language is "Sickness"
La fiestaque organizamos es una enfermedad impresionante...
A portmanteau of the english ‘infernal’ and the french ‘enfer’: enfernal (and its adjective and verb tenses) connotes a double or extra-hellish thing, place, or event.
The hopeless feeling you get that you've been in this situation before. Possibly several times. Usually referred to in reference to reoccurring business meetings.
Upon listening to your coworkers drone on about the same old topics at yet another mind-numbingly reoccurring meeting, you suddenly realize you are experiencing deja d'enfer. You've been through this hell before... several times.