Nuclear code refers to the classified authorization codes used by military and government officials to authenticate orders for launching nuclear weapons. In the US system, these codes are part of the 'nuclear football' protocol that travels with the President at all times. In everyday conversation the phrase often gets used dramatically to describe any heavily guarded secret or impossibly secure password — if your WiFi password is called a 'nuclear code,' someone's being a bit theatrical.
She kept her cryptocurrency wallet backup phrase guarded like a nuclear code — memorized, never written down, told to no one.
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(US, military) A go code.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.