Definition of wild-ass:
(adj) :
Untamed; not domesticated.
(adj) :
Unrestrained or uninhibited.
(adj) :
Especially, being of the wild type: being of an unbroken ancestral line of undomesticated animals, as opposed to being feral, being an undomesticated animal whose ancestors were domesticated.
(adj) :
From or relating to wild creatures.
(adj) :
Being in the wild, by any pathway (whether by being of the wild type, by being feral since birth, or by being feral after escape from domesticated life).
(adj) :
(slang) Amazing, awesome, unbelievable.