'Peep-o'-day boys' definitions:

Definition of 'Peep-o'-day boys'

From: GCIDE

Peep \Peep\ (p[=e]p), n.
1. The cry of a young chicken; a chirp. [1913 Webster]
2. First outlook or appearance. [1913 Webster]
Oft have we seen him at the peep of dawn. --Gray. [1913 Webster]
3. A sly look; a look as through a crevice, or from a place of concealment. [1913 Webster]
To take t' other peep at the stars. --Swift. [1913 Webster]
4. (Zool.) (a) Any small sandpiper, as the least sandpiper ({Trigna minutilla}). (b) The European meadow pipit (Anthus pratensis). [1913 Webster]
Peep show, a small show, or object exhibited, which is viewed through an orifice or a magnifying glass.
Peep-o'-day boys, the Irish insurgents of 1784; -- so called from their visiting the house of the loyal Irish at day break in search of arms. [Cant] [1913 Webster]