Green’s Dictionary of Slang

1. an outside lavatory.

1900

E.H. Babbitt ‘College Words and Phrases’ in DN II:i 33: Egypt, n. Privy, water-closet.

2. the black section of a town or city [the dark complexions of US blacks and Egyptians].

1944		Post (Lanarks) 23 Apr. 6/3: Egypt — negro district.
1979		Maledicta III:2 158: Egypt n Negro district; from the dark complexion of Egyptians and the alleged exoticism of the Negro district.

3. see Bumfuck, Egypt n.