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D. U. N. S. means Dont Underclassmen Noobs Suck. It’s when you laugh at weak underclassmen and make them feel like they should be in the bathroom crying.
My homies D. U. N. S. ed me in front of the whole school. I was so embarrassed I ate my lunch in the trash can.
My little bro got D. U. N. S. ed by the football team. He cried like a baby and ran out of the cafeteria.
My crush D. U. N. S. ed me during lunch. I spilled my milk and my heart broke.