쿵쿵 (kung-kung) is a fun and expressive onomatopoeia. It's the Korean sound for a heart beating fast, similar to 'thump-thump' or 'ba-dump ba-dump' in English.
In "OVERDRIVE", TWS uses this sound to perfectly capture the feeling of a racing heart and the overwhelming excitement of having a crush. It's a simple but incredibly powerful word that makes you feel the singer's emotion as his heart goes 쿵쿵!
Have you ever had a crush so intense it felt like your whole system was going into overdrive? That's exactly what TWS is singing about in this super high-energy track! The song perfectly describes that feeling of being completely overwhelmed by someone. He sings, "너 땜에 놀라 놀라버린 맘이야" (My heart is startled because of you) and "Hot, hot 뜨거 뜨거 my body's gonna blow up" (Hot, hot, it's hot, my body's gonna blow up). It's that feeling where just one look from them makes your heart go "쿵쿵" (thump thump).
The lyrics are full of this funny, slightly panicked energy. The singer feels like seeing this person was his "최대 실수지" (biggest mistake) because he just can't handle the feelings. He asks, "원래 다 이런가요?" (Is it always like this?), as if he's the first person to ever feel a crush this strongly. But by the end, it seems the other person feels the same way! He decides that even if his "온몸이 부서진대도 괜찮아 함께라면" (whole body breaks, it's okay if we're together). It's a sweet and explosive song about a crush that pushes you to your absolute limit.