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headlight fluid

(originally, North America, automotive, _, slang, now, also, Internet slang, humorous) A fictional ostensible automotive product, used in jokes, to prank someone into searching for the nonexistent ite

ˈhɛdˌlaɪt ˈfluədDocumented since 2000s2000sGen Z191 viewsLast reviewed Jun 29, 2026+ Add a definition
🌐 Internet & Memes
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Born ~2003 · no dated citations yet
2003BornToday, 2026
Late-Millennial / Web 2.0 eraSee decade cohort →

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#1·Apr 26, 2026

(originally, North America, automotive, _, slang, now, also, Internet slang, humorous) A fictional ostensible automotive product, used in jokes, to prank someone into searching for the nonexistent item (a snipe hunt), or to gauge how inept someone is in basic auto mechanics.

Origin: Perhaps (see quotations), from . By analogy with blinker fluid, itself referencing real automative items and products such as brake fluid and diesel exhaust fluid. Later further popularised as an Internet meme after 2003 by an episode of the web series Red vs. Blue. Origin information sourced from Wiktionary contributors (CC BY-SA 4.0).
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Viral internet speak — memes, ratios, main-character moments, and the algospeak of every platform from Twitter to Reddit to TikTok comment sections.

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