The distinct melancholy or mourning one may experience when thinking about the potential pasts, presents, and futures one may have experienced had they made different decisions in their life; a negative reaction to the endless stream of possibilities and 'what if's one accumulates throughout their lifetime
"Dude, I've been thinking about how my life could be right now if I did get together with that one girl from school, and now I'm super bummed."
"That's just Zeitenschmerz for you."
by Who's Dom? April 8, 2021
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