public transit death spiral 

The process by which a chronically deprioritized, underfunded and racialized municipal public transit system originally conceived as a public good for efficient daily mobility needs is further morphed by the political establishment and the capitalist system into an afterthought with an unsustainably funding model, leading to a feedback loop of reduced service, reduced ridership and reduced investment to the detriment of all people.

"Do you remember back in 2020 when the United States Congress failed to appropriate necessary funds during the COVID-19 pandemic and thus enabled a nationwide public transit death spiral from which we're still recovering in 2040?"
"Yeah, that sure was disappointing and avoidable!"

public transit death spiral by Sarcastic&Concerned December 8, 2020

Horny eagle death spiral 

Sam o nella's way of describing what happens when something quickly deteriorates in value or quantity.

Sam o nella: "It dawned on people that these pieces of paper wouldn't be useful in a pile of wet tea and smoldering patriots, causing their value to do one of those horny eagle death spirals"

Horny eagle death spiral by quanferv April 18, 2021

Mexican Death Spiral

(1) A condition that describes the complete shut down of traffic in the leftmost lanes of a multiple lane two-way street in which opposing lanes of traffic are separated by a median or neutral ground. In a Mexican Death Spiral, the first car car heading in one direction attempts to turn left across the median and comes to a stop to allow traffic to safely pass. Another car heading in the opposite direction also attempts to turn left across the same meridian and comes to a stop to allow traffic to safely pass. The death spiral is complete when additional cars stop behind the earlier stopped cars such that neither of the first cars can turn left because the path is now blocked by the subsequent stopped cars that have left no gap to cross.

(2) A situation that has come to an irreversible standstill, typically on internet message boards by two forum trolls clogging up the thread with their own tangential argument.

(1) Q: What took you so long to get here?

A: There was a Mexican Death Spiral at Carrollton Avenue that had traffic backed up for 10 minutes.

(2) Thanks PosterA and PosterB for causing yet another Mexican Death Spiral.

Mexican Death Spiral by Denman Cinqueports March 29, 2010