Definition of warchalking noun from the Oxford Advanced American Dictionary

 

warchalking

 noun
noun
NAmE//ˈwɔrˌtʃɔkɪŋ//
 
[uncountable](informal)
 
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the action of drawing a symbol on the wall of a building to show that you can get a free Internet connection near that place
See the Oxford Advanced Learner's Dictionary entry: warchalking