"Heart Shaker" by TWICE is a song about falling in love at first sight. The lyrics describe the hesitations and doubts one experiences when considering approaching someone they are attracted to. The song encourages the listener to take a chance on love and not miss out on the opportunity to be with someone they are attracted to. The chorus repeats the phrase "You're my heart shaker" which refers to how the individual has shaken the singer's heart and has become their love interest. The bridge of the song speaks to the hope that the other person will reciprocate the singer's feelings and the encouragement to take the first step towards expressing their love. Overall, the song has a positive and upbeat tone, encouraging the listener to pursue love and take risks.
—SongTell