Please give proper credit where it's due; more importantly, show some respect to one of the OG webcomic makers, Randall Munroe. The dude's a fucking legend. Yಠ_ಠY
It's an Internet joke: you end a phrase with "deez", which makes someone ask "deez what" because it's an incomplete sentence, and they respond with "deez nuts".
It's a major plot point for the Jesus fandom.