DJVT is short for De Jeugd Van Tegenwoordig, a Dutch phrase that translates to The Youth of Today. They are an Amsterdam-based hip hop group known for being playful with their lyrics, and it definitely shows in their video for Hollereer.
When I first saw the video, I wasn't sure if it was a parody or just a Dutch-flavored version of hip hop. After a few viewings, I don't think it matters. The video is a lot of fun and the song is catchy with a great 8-bit beat.
There isn't a lot of english info about the group on the web. According to Wikipedia:
The group is comprised of Vieze Fur ("Dirty Fur") a.k.a. Vieze Freddie ("Dirty Freddie") or Baksteen ("Brick") (real name Freddie Tratlehner), P. FabergÃ© a.k.a. P. Dronq or Peppie (real name Pepijn Lanen) and Willie Wartaal a.k.a. WiWa (Wartaal means "gibberish" or "ravings") (real name Ollicio Locadia).