Green’s Dictionary of Slang

moby (dick) adj.

ill, sick.

1992		R. Puxley Cockney Rabbit.
1996		P. Howard The Joy (2015) [ebook] I’m feeling a bit Moby Dick.
2003		B. Dark Dirty Cockney Rhy. Sl. 81: I knew I shouldn’t have eaten those cockles; I feel Moby Dick now.
2005		P. Howard Curious Incident of the Dog in the Nightdress 4: I’m feeling a bit Moby and I think I’m going to vom. [Ibid.] 21: I’m starting to feel moby Dick all of a sudden.