ex. A crazy ass man trying to fuck up parts of his soon to be ex-wife's life.
Bitchasses can be more dangerous than a similar type female. (Their motives, strategies, goals, etc are different.)
I had never heard someone called a bitchass, until I came up with it as a word for my husband in 2008.
"I hear him gripin' in the background. Tell your Bitchass, what a dumbass he is"
"That Bitchass is up to something. That muthufucker!"