joke headcanon: "this tastes horrible, what the f*ck is this- GAAA~" and it took a whole day for the wings to come in :\
actual headcanon: A curse from after the events of Kirby's Adventure and before Meta Knight's Revenge. The chaos gods decided to put a lot of chaos shit into one person and randomly put it into meta knight because "[They] felt he was suited for this 'blurssing (blessing + curse)'"