Extinction balls are what a man is left with after a vasectomy. If we relied upon these balls to propagate the human species it would cause extinction of the species.

Latin: extinctio sphera
random guy: Hey dude how are your balls doing
dude: Not bad but I think I will change them to extinction balls, the child support bills are too big.
by the bestestestest person ever November 3, 2020
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When a particular kind of animals or plants stops existing
The extinction of dinosaurs was from a long time ago
by عليوه June 5, 2017
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A seriously underrated gamemode from Call of Duty: Ghosts where instead of killing zombies, you destroy fungal colonies called "Hives" and kill hordes of ancient creatures known as Cryptids along with the final objective depending on one of FIVE missions you choose to complete. Lore-wise, the events of unearthing the cryptids led to Humanity's possible extinction, hence the name.
Guy 1: People STILL play Extinction?
Guy 2: Yeah dude it's still alive on Console
by Darthbuttkiss January 20, 2023
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