function changeChannel(channelID){

jQuery(document).ready(function($) {
  var data = {
    'action': 'watchme_change_channel',
    'whatever': channelID
  };

  jQuery.post(ajaxurl, data, function(response) {
    alert(response);
  });
});

add_action('wp_ajax_watchme_change_channel','watchme_change_channel_callback');
add_action('wp_ajax_nopriv_watchme_change_channel','watchme_change_channel_callback');

 function watchme_change_channel_callback() {
global $wpdb; // this is how you get access to the database
global $videos_meta;
global $programming_meta;
$whatever = $_POST['whatever'];

$echo_var[0]=get_user_meta($whatever, $videos_meta)[0];
$echo_var[1]=get_user_meta($whatever, $programming_meta)[1];
echo "life is not easy";

wp_die(); // this is required to terminate immediately and return a proper response