Green’s Dictionary of Slang

(US) a filthy or disgusting person or thing.

1968		Letter in Edelman Dear America (1985) 10 May 178: I feel like a crudball leaving my men.
1977		L.K. Truscott ‘Dirty Laundry’ 🌐 Finally some crudball gave her a dose of the clap and she became a carrier, infecting a couple dozen guys.
1997		Simon & Burns Corner (1998) 71: When you do these things, of course, you’re simply playing the game; when these things are done to you, it’s the work of a crudball.
2004		reelroundtable.blogspot.com 8 Mar. [blog] After I Spy, Shanghai Knights, The Big Bounce and now this crudball – when he comes out with something that’s good again – it might feel like the boy who cried funny one too many times.