noun
bitch; fucking bitch
Strongly derogatory slang; used as an insult, often in heated or vulgar speech. The prefix クソ intensifies the insult.
あのクソビッチ、また嘘つきやがった。
That fucking bitch lied again.
クソビッチって呼ばれて、さすがに傷ついた。
Being called a fucking bitch really hurt, even for me.
ビッチ alone means 'bitch' or 'slut' and is already derogatory; クソビッチ adds the intensifier クソ ('shit/fucking'), making it much more vulgar and aggressive.
Compound of クソ (kuso, 'shit/fucking', an intensifier) and ビッチ (bitchi, from English 'bitch'). The word is a modern slang coinage, not a traditional Japanese term.