What does "prog" mean?

Prog: To steal; to rob; to filch. [Low] Johnson.

Additional senses

  1. 2.To prick; to goad; to progue. [Scot.]
  2. 3.Victuals got by begging, or vagrancy; victuals of any kind; food; supplies. [Slang] Swift. So long as he picked from the filth his prog. R. Browning.
  3. 4.A vagrant beggar; a tramp. [Slang]
  4. 5.A goal; progue. [Scot.]

Sources