Green’s Dictionary of Slang

1. (also crap-o) disgusting, appalling.

1977		S. Stallone Paradise Alley (1978) 152: What if I ain’t satisfied with this crap-o arrangement?
1983		R. Price Breaks 25: Two dozen neon crappo carpet clearance and pancake joints.

2. as an excl.

1986

H.B. Gilmour Pretty in Pink 77: ‘Crappo!’ Duckie hollered.