What Does This Mean?
A man who reflexively replies to a specific woman's (or high-profile account's) every post, usually with unsolicited opinions, flirtation, or correction, regardless of whether anyone asked.
EXPLAINER

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REAL-WORLD EXAMPLE
"He's replied to every single one of her posts for eight months straight. Certified reply guy behavior."
LORE & ORIGIN
Coined within Twitter/X culture in the late 2010s to describe a recognizable pattern of compulsive, unwanted replying behavior, it became a stable archetype label used to call out the behavior the instant it's spotted.
MENTIONS OVER TIME
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