Poker Acronyms - YW
YW = "You're Welcome"
Usually used at online poker tables - "YW" is short for "you are welcome" and is generally typed by a player in response to another player thanking a first player for a compliment. The exchange might, for example, go something like this : "NH" (nice hand), "TY" (thank you), "YW" (you are welcome).
Note : people who type yw are generally the chatty kind, since it isn't really necessary.