war‧chalk‧ing /ˈwɔːˌtʃɔːkɪŋ $ ˈwɔːrˌtʃɒːk-/ noun [uncountable] technical
the activity of drawing symbols on the pavement to show the position of a wireless Internet network which hackers can use to make a free connection to the Internet

[TahlilGaran] Dictionary of Contemporary English ▲