Oof September 14, 2026 by 1 min read Oof — An expression of sympathy, discomfort, or mild disappointment. “Oof, that fall looked painful.” Origin: General internet reaction slang, spread mainly through TikTok and X/Twitter comment sections. Reactions & internet culture More Terms You'll LoveStanding on BusinessSigmaEZ ClapFoldedFanum TaxPick Me