Wi-Fi squatter

(名詞) 逗留於公共場所使用無線網路上網的人;未經允許就使用無線網路上網的人。
Wi-Fi squat (動詞):逗留於公共場所使用無線網路上網;未經允許就使用無線網路上網。

Two men have been arrested on suspicion of "wi-fi squatting" after allegedly logging on to another person's internet connection illegally.
—Ben Guy, "Arrested over 'web squatting'," The Journal, February 23, 2008

Cafe owners have tried a variety of tactics to foil Wi-Fi squatters. They put out signs that ask laptop users to share tables or point them to nearby Wi-Fi hot spots such as public libraries.
—Jessica Guynn, "Coffee shops are taking Wi-Fi off the menu," Los Angeles Times, August 8, 2010