Neighbornetting

The act of using someone else's wifi without permission. Generally refers to use of that of a nearby residence, company or other such building. The party who's internet connection is being leeched off of is usually unaware of the act.

"Yo, man, my net's been down so I've been neighbornetting."
"What? Dude, if they find out you've been stealing their wifi they'll be pissed."