From “A Dictionary of Cantonese Slang”, p.326:
怕你有牙 – a sarcastic challenge to someone who is behaving in a bullying manner, “I’m really afraid of you!” (i.e. “I’m not afraid of you!”)
[synonym] 怕你有毛
怕你有牙 – a sarcastic challenge to someone who is behaving in a bullying manner, “I’m really afraid of you!” (i.e. “I’m not afraid of you!”)
[synonym] 怕你有毛