What does 1437 mean on TikTok?
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TikTok Slang: A Complete Guide To The Meanings Behind Each Phrase

42. What does 1437 mean on TikTok?
The 1437 TikTok phrase actually means "I love you forever". The phrase is all to do with the number of letters in each word. For example, "I" is a one letter word therefore the 1 in 1437 represents that. "Love" contains four letters, “you” contains 3 letters and “forever” contains 7 letters. Although the term is popular on TikTok, it's actually been used as an abbreviation for years in text messages and on chat forums.