Usually refers to a
man. Bitchass is one who posesses such qualities that usually stem from insecurity, egotism, 'rejection backlash' (cold heartedness, conniving, etc often
triggered by 'loss' of psychosomatic support mechanism/network.
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.