so long meaning
UK /səʊ lɒŋ/ US /soʊ lɔŋ/ 2 syllables
so long (noun): a farewell remark.
Definition of so long
How to pronounce so long
so long is pronounced /səʊ lɒŋ/ in British English and /soʊ lɔŋ/ in American English. It has 2 syllables.
More about so long on Wikipedia.