Sunshine meaning : The direct rays, light or warmth of the sun. A location on which the sun's rays fall. Geniality or cheerfulness. A source of cheerfulness or joy. The effect which the sun has when it lights and warms some place. Friendly form of address often reserved for juniors. Ironic form of address used to an inferior or troublemaker. Used to address someone who has just woken up and/or is very sleepy. Open to and permitting public access, especially with regard to activities that were previously closed-door or back-room meetings.