XP

1. Slang often used for describing Microsoft Windows XP.
2. When referring to a game, XP is also used as an abbreviation for eXPerience. XP is often gained when a player in a game defeats or kills an opponent at equal or greater skill. When the player gets enough experience his or her level will increase.
3. XP is also used to describe the AMD Athlon XP processors.
4. Finally, XP or xP is also a emoticon with its tongue out.

Also see: Game definitions, Operating system definitions, XP2