"to go" and "to be all" are used for "to say" in casual conversation, especially among young Americans.
So he goes, "What are you doing tonight?" And then she's all, "It depends. What have you got in mind?" Then he's all, "How about a movie?" And she goes, "Can't tonight."
But usually "to go" with this meaning is limited to the sounds of animals. "to be all" i