In Uno, you're supposed to say ‘Uno’ as you play your second to last card (indicating you are close to winning).
I think the internet use is usually “reverse uno (card)” which means the tables are being turned, aka what you tried is being reflected back at you.
alt Hacker News
I think the internet use is usually “reverse uno (card)” which means the tables are being turned, aka what you tried is being reflected back at you.