I know Americans use this slang, mostly young people, but adults too sometimes.somebody was all
Do you say this to mean 'somebody said'?
"John and I were walking on the street, and
he was all, "She's nice."
Is it American usage?
And yes, it usually leads into something somebody said, but action/behavior can also be included. I found some samples for you to read on the net if you like. Though the language isn't very polite, it is a good example of this slang.
Student or Learner