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“What have you been up to?” means asking a person about the recent activities they have been doing, especially when they have been away from you.
“Roger that” found itself in the aviation industry and the military. The term is often used to confirm that the content of the message has been received.
There are lots of ways to say "hello" to someone. The choices of how to greet someone depend on whom you’re talking to and, therefore, may vary.