WordPress at a glance
action is not described

wp_user_dashboard_setup action-hook . WP 3.1.0

Fires after core widgets for the User Admin dashboard have been registered.

Usage

add_action( 'wp_user_dashboard_setup', 'action_function_name_2217' );
function action_function_name_2217(){
	// action...
}

Where the hook is called

wp_dashboard_setup()
wp-admin/includes/dashboard.php 82
do_action( 'wp_user_dashboard_setup' );

Where the hook is used (in WP core)

Does not used.