Historical clue formulations

• Texter's "Duh!" — 2026-09-06
• "No duh!," in modern lingo — 2025-11-15
• Self-evident, informally — 2024-12-17
• Clearly, in a text — 2023-07-06
• "Duh!," in modern slang — 2023-01-30
• "Duh," in modern slang — 2022-01-23
• "Duh!," in modern slang — 2021-09-26