When you don't lay a card down on the discard pile you will pass play by saying "Pass".
Penalty
Penalties are either enforced or unenforced to keep the integrity of the game in tact.
Perfect Pair
Perfect pairs are formations that consist of two different general cards that logically go together and if put together they can't be stolen. Perfect pairs are shotgun & pistols, nickels and dimes, X's & O's, and pigskin and horsecollars.
Pick Six
A card that can make an opponent pick up 6 cards.
Pigskin
A family of pigs in this game.