Meaning of “KusoVice(クソバイス)”

“KusoVice(クソバイス)” means shitty advice.
“Kuso(クソ)” means shit and in this case, “Vide(バイス)” is an abstraction for advice(アドバイス).
This is a slang.

Example Conversation

A: I talked to my boyfriend about that thing.
B: Yeah? How did it go?
A: He gave me just a kusovice(クソバイス). Seriously, he’s hopeless.

A: あのことについて彼氏に相談してみたんだけどさぁ
B: うん、どうだった？
A: 糞みたいなアドバイスしかくれなかったわ。あいつやっぱダメだわ