What Does ' Rainbow Kiss ' Mean On TikTok The Viral Slang Term Rainbow Love Peck Heart: Signifying bliss and diversity, the rainbow kiss holds greater meanings. This charming fusion of colors and emotional gesture expresses affection . Whether it stands for optimism, self-esteem, or togetherness, the meaning behind the colorful smooch moves souls. Embrace the vibrancy and share the love with a delightful colorful smooch.