Etymology

blue check

Today it means: A Twitter user whose account was verified by Twitter as authentic (i.e. not a parody or imposter account) and deemed to be of public interest prior to this system's replacement by a paid verification scheme in early 2023. Full definition →

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The story

From the blue check mark badge that was previously displayed beside the names of such users. The second sense derives from the rude behavior from an influx of users who paid for extra features in their Twitter accounts from early 2023 onwards.

Etymology from Wiktionary, CC BY-SA 4.0.