Green’s Dictionary of Slang

1. boiled meal served with molasses.

1903

G.D. Chase ‘Cape Cod Dialect’ in DN II:v 294: squeal, n. A dish of boiled meal served with molasses.

2. bacon; ham.

1908		Commercial (Union City, TN) 22 May 5/1: ‘Two cackles slapped in the face and three squeals crisp,’ howled the waiter.
1916		Day Book (Chicago) 8 Sept. 17/1: ‘An order of ham and eggs’ [...] Roast two on a slice of squeal!
1922		[as cite 1916].
1936		Charleston (WV) Daily Mail 9 Oct. 8/8: This is the fantastic jargon of the soda jerkers: [...] ‘toast two on a slice of squeal’ is ham and eggs.
1949		Monteleone Criminal Sl. (rev. edn) 222: squeal and artillery Pork and beans.