jaded
The most prominent term used from the most burned out DJs, party goers, clubbers and ravers from the 1990-2010s until present. Sometimes used to reference the charming memories of music, production, DJing vinyl records, amazing parties, or mysteriously waking up in a cuddle puddle grounded by 100s of other people who have no fucking clue how they got there 30 minutes ago either. Later as the "Jaded One" ages they willingly connect with others just as jaded as they are and laugh endlessly about their life experiences.
Examples:

"Hmm I guess that's why Jeff is Jaded?"

"Why is that guy just standing by that speaker in the dark corner the whole night?"
Reply: "Don't mind him he's just jaded."