Wife Jacking 

This is when your best friend and your wife run off together, or vise versa. Times have changed though and this is no longer a "vigilante" issue. Suck it up folks, adults can date who they want, married or otherwise. This is also known as spouse jacking or hustband jacking; variations include Spouse Burglary, Wife Burglary and Husband Burglary. It's a specific form of cheating or having an affair.

I heard Jen and Cray are splitting up.
Yeah, turns out Jay was Wife Jacking for months!

Wife Jacking by Dimmesdale August 29, 2013

wifijacking 

What you get when you connect to any wifi, with or without his or her knowledge.

Best thing about wifijacking...i'm dropping a deuce and jackin someone's wifi. Just thought you should know.

wifijacking by emilpicasso.com September 6, 2010