Definition
When someone says "that ain't it," they are expressing disapproval about something someone has said or did that crossed the line and is in poor taste. It may be said in-person, sent in a text message, or posted online.
Origin
slang.net
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See “That Ain't It” in Corporate Speak, Gen-Z Slang, Pirate Speak, and more.
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ikykwak
I know you know we all know...