This is a nickname given to Jimin and Jeongguk, two members of the biggest boy band in the world, BTS. It was given to them by their fanbase in Korea, and in hangul, it is, 해달즈. While Jimin is the moon, Jeongguk is the sun. There is also a double meaning to the hangul, 해달, which means that they resemble otters. Coincidentally, in BTS's 2020 MMA performance, the Black Swan performance began with a sun and moon turning into an eclipse. Jimin and Jungkook danced beautifully together and even added a pas de deux within the choreography. Generally, males and females dance the pas de deux together, so Jimin and Jeongguk broke the gender norms.

When you go to high-five someone and the other person goes to pound it and you end up high-fiving that persons fist.