Definition of wp
If you read "wp" in a poker chat room, it will mean "well played". This is a comment you may receive after, for example, a good bluff on your part or after winning a pot with a very strong or unusually played hand. When your opponent is impressed with the way you played a hand, he may say "well played" or "wp". To which you can reply "ty" for "thank you".
Wp, nh, gg, ty, vgg
At first, you may be a little confused with all these shortcuts and jargon, but as you see them passed around the chat room, you will get used to them. Wp means "well played", nh means "nice hand", gg means "good game", ty means "thank you", vgg means "very good game". Generally speaking, even after suffering a big badbeat in a big tournament, you'll want to remain polite and diplomatic. You won't gain anything by insulting your opponents; on the contrary, by exchanging a few polite words with them, you will gain their respect. It's always better to have a professional image at the poker table than an emotional, unstable player.