An informal variant spelling of 'so', used for emphasis or in casual speech and writing.
Variant spelling of 'so' from Old English swā 'in this way, to such a degree'. The double-o spelling emerged in internet communication to convey prolonged pronunciation or emphasis.
The 'soo' spelling became popular in text messaging and social media because it mimics how people naturally elongate the vowel sound when speaking emphatically. It's part of a broader trend of phonetic spelling in digital communication, like 'sooo cute' or 'sooo tired.'
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