Definition of duding:
(n) :
(informal) A failure of any kind.
(n) :
(informal) A device or machine that is useless because it does not work properly or has failed to work, such as a bomb, or explosive projectile.
(n) :
(informal) A loser; an unlucky person.
(adj) :
Useless; failing; ineffective.
(n) :
A lottery ticket that does not give a payout.
(n) :
(obsolete, informal) Clothes, now always used in plural form duds.