The song "Say When" by Starship is a love song about waiting for the right moment to express one's feelings. The lyrics describe the feeling of being deeply in love with someone and wanting to make it last forever. The narrator encourages their love interest to reach out to them and tell them when the time is right to take their relationship to the next level. The chorus repeats the phrase "Say when" to emphasize the importance of waiting for the right moment to act on one's feelings. The song acknowledges the power of love to take control of one's life and the potential for it to make a person feel whole. Overall, "Say When" is a hopeful song that encourages listeners to pursue love and wait for the right moment to make a move.