"Dn" is short for "Deez Nutz".
Someone roasted a Streamer. When the Streamer asked the person what DN stood for, they responded deez nuts. The Streamer is now using that joke/roast on another.
"Becky, all you get tonight is DN."
"You'll have to work with DN gurl."
"-Welcome to Wendy's, what can i get you?
-Gimmie DN with fries"
