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English word bitch-ass comes from English bitch, English -ass
bitch (English)
(colloquial) A complaint, especially when the complaint is unjustified.. (colloquial) A queen (playing card), particularly the queen of spades in the card game of hearts.. (colloquial, usually only used in the singular) A difficult or confounding problem.. (dated, or, specialised, dog-breeding) A female dog or other canine, particularly a recent mother.. (figurative) Something unforgiving [...]
-ass (English)
(North America, slang, vulgar) Converts an adjective into a noun having the meaning of, "one who is [adj.]".. (North America, slang, vulgar) Intensifies an adjective.
bitch-ass (English)
(AAVE, slang, pejorative) Contemptible.. (AAVE, slang, pejorative) Weak, cowardly; unmanly. (AAVE, slang, pejorative) A contemptible person.