both their arms up parallel to the ground (resembling a bird), while simultaneously bobbing their head and making bird sounds. It is also appropriate for a person to twitch their arms as if they were shaking their wings.
guy: “What are you doing?”
guy: “That’s such a cool dance move, let me try!”
girl and guy: “Pickawwwwwwww!”
bystander: “What are you doing?”
guy: “The MOVE IT LIKE BIRDIE!”