When you don't know what to say, but want to start a sentence or continue a sentence.
Person 1: Hi!
Person 2: Hi!
Person 1: Soooooo...
Person 2: Did you hear about that 3 headed dog? He...
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AAAAAAAAAHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
SOOOOOOOOOOOOOOOOOOOOOOOOOOOOAAAAAAAAAAAAAAAAAAAA
How are you doing?
Soooooo?
So what?
Soooooo = how are you doing?