左心口的跳右心口的疼
[zuŏ xīn kŏu de tiào yòu xīn kŏu de téng]
It's an abstract expression where '左心口' (left side of heart area) represents excitement or happiness whereas '右心口的疼' (right side of heart area pain) suggests heartache. It could mean someone has complex emotions: they might be joyful on one hand but pained on the other hand.