Definition

In internet slang, something or someone that lacks credibility, is easily dismissed, or has no legitimate standing; not worthy of serious consideration.

Example Usage

His argument was invalid—he had no receipts to back up what he was saying.

Origin

Technical term from computing (not legally binding/non-functional) repurposed as internet slang for dismissal.

Fun Fact

Often used to shut down debates or mock someone's bad take with comedic finality.

Source: Definition backfill (hailey)

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See “invalid” in Corporate Speak, Gen-Z Slang, Pirate Speak, and more.

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