Green’s Dictionary of Slang

1. the player who shouts out in pitch and toss.

1873		Sl. Dict. 252: Pieman In tossing, the man who cries is called the PIEMAN. In the old days when the itinerant pieman’s duty was to toss or sell, and his call was, ‘Hot pies, toss or buy, toss or buy,’ he was always supposed to be entitled to the cry, the intending eater ‘skying the copper.’.
1882		Sydney Sl. Dict. (2 edn) 7: Pieman - In ‘skying the copper,’ the one who calls.

2. the game of pitch and toss.

1981		(con. c.1903) A. Harding in Samuel East End Und. 73: We were back in Brick Lane watching a game of ‘piemen’.
1984		Partridge DSUE (8th edn) 876: [...] In C.20.