An exclamation of extreme surprise, or fear.
JapaneseDude:Holy Crap, it's GOOOOOOOOODZIIIIIIIILLLLAAAAAA!
Expressing a mixture of extreme emotions such as fear, surprise or happiness.
Gina: How was your work out today?
Brad: Holy Crap, it was impossible. Holy Crap, I can barely walk. My quads are killing me...Holy Crap!
Gina: What is your work out like tomorrow?
Brad: Holy Crap, I don't know...I'm afraid to look. Holy Crap!
Gina: You look buff
Brad: Holy Crap, I'm getting stronger and more fit. Holy Crap, I can notice a difference already. Holy Crap!