Seventeen reveal they slap each other with their own butts?

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The interviewer brought up the topic of Seventeen's extravagant performance on stage, asking how long the members practiced. They answered, "All night. When we're practicing the most, it adds up to about 15 hours minus time for sleeping and eating... We've gone into the practice room when the sun rose, and when we left, the sun had risen again. We practice without knowing that time is passing by." 

The interviewer then mentioned that some groups use punishments to lessen mistakes. It turned out Seventeen had their own unique method of punishment as Seungkwan revealed, "We have this thing called a 'butt slap'. We slap the person who made a mistake in the face with our butt." To this, Woozi added, "Because you get hit with a butt, it doesn't hurt. It's just a little demeaning and makes you angry (laughter)." 

So which member gets the 'butt slap' the most? And which member is the best at giving the 'butt slap'? Hoshi replied, "The performance team gets hit with it the most. They make the choreography and change it up so much, they get confused about it the most." 

Woozi then added, "The guys who hit other members the most are Seungkwan and DK." DK agreed, "I have wide hips, so I'm confident in my 'butt slap' (laughter)." 

Well Carat, you've learned something new about Seventeen today!