Definition
An acronym that is referenced when saying goodnight to another person; used to wish a person pleasant dreams; often used when chatting, texting, or on Facebook; similar toGNST.
Origin
slang.net
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See “SD” in Corporate Speak, Gen-Z Slang, Pirate Speak, and more.
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Beginner
wtfiwwu
what the f**k is wrong with you...