informal greeting meaning 'what's up' or 'hello'
shortened form of 'what's up', popularized in American slang in the 1990s, though 'sup' as a verb meaning 'to take supper' dates to Old English
While 'sup' as a greeting is pretty recent, the verb 'sup' meaning 'to eat supper' is ancient - Shakespeare used it regularly! It's funny how old words get new meanings.
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