War Walking, is similar to WarDialing and WarDriving. Except using feet instead of modems, or wheels. Basicaly, take a really light notebook, a pvc pipe yagi that you made, and wander around town while the tourists look at you like you're nuts. Which of course, you are.
[http://www.blackbeltjones.com/warchalking/ War Chalking] is a movement to "tag" an area covered by wireless "hot spots". It's a cheap, easy way to indicate public wireless 802.11 access using chalk. "Mark-up" curbs, walls or sidewalks - wherever you find wireless access.
[http://www.blackbeltjones.com/ Blackbelt Jones] explains that [http://www.blackbeltjones.com/warchalking/ War Chalking] is a pun on WarWalking - itself derived from [http://www.personaltelco.net/index.cgi/WarDriving wardriving] which has it's root in [http://www.personaltelco.net/index.cgi/WarDialing wardialing].
War Chalking adopts [http://www.worldpath.net/~minstrel/hobosign.htm hobo sign language].
Get your [http://www.netstumbler.com wa-was] out!