How do you spell dufus?

yes indeed,have done some research on dufus. And what I have come up with is, other names for dufus is han-au-furk,yorkindorr,goofoodooroo, Yingunthihh, and I have done some other research about a dufus and another meaning for dufus is a fly poop, when land on arm, and createspipuls on you skin.