The process of searching for Wi-fi. Or the act of searching for Wi-fi in public places such as Starbucks or Mickey D's, usually involves walking the perimeter of your property in search for Wi-fi.
Person 1:I caught a god damn Wi-fisher in my backyard slowing down my internet!!
Person 2:Yeah fucking Wi-fishers are all over
Person 1:Where were you yesterday? I went to your house twice.
Person 2:I was Wi-fishing, I found a sweetass spot on my roof, 11 Mbps
Person 1:Fucking Wi-fisher!!!!
Constantly trying to get a wifi connection with your laptop.
Joe got wifi by standing on the top of his bed after constantly wi-fishing.