A chromosomal disorder which causes one to both appear as if one has down syndrome and also to pull off some amazing dance moves. People with get down syndrome are funny looking. This has lead evolutionary biologists to speculate that it is only by being able to dance incredibly well that people with get down syndrome are able to attract mates and procreate, albeit sloppily.
That funny looking asian guy in the glasses can bust a move like no other! He must have get down syndrome!