wumplestomper
Black kid(s) walking slowly and/or grouped together in such a way that they inhibit proper human trafic flow in the affected area, which is most often a crowded hallway. Will easily become indignant when confronted about thier wumplestomping habits.
"Yesterday Mark got stuck behind a group of wumplestompers and said 'excuse me' in an attempt to get by. They turned around and looked at him, looked at eachother, and then one of them said 'Pfffttszszttsz whaz dat cracka think he's doing??'"