"You are my happy pill" is an affectionate and endearing expression typically used to convey that someone brings joy, happiness, and emotional well-being to the speaker's life. The phrase "happy pill" is a metaphor for something that brings happiness and acts as a source of emotional upliftment, much like how a medical pill can alleviate physical pain or discomfort.
When someone tells another person, "you are my happy pill," they are essentially saying that the person's presence, actions, or the way they make them feel has a positive and uplifting effect on their mood and overall outlook on life. It suggests that being around that person brings comfort, happiness, and a sense of contentment, much like how a medication might alleviate distress or sadness.
Overall, it's a sweet way of expressing deep affection, gratitude, and appreciation for someone's role in making life brighter and more joyful.