To conceal in the hand. To paum a die: to hide a die in the palm of the hand. He paums; he cheats. Don’t pretend to paum that upon me.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Paviour’s Workshop * PaunchNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes