To call someone an excessive number of times. This can also be used to describe text messages and instant messages
Jesus, she's called me 14 times already today. She won't stop war dialing me
by Trommler March 8, 2008
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When you war dial,at least back in the days of BBSes, you are scanning every phone number in a range (eg 555-555-xxxx) to find BBSes,fax machines,carriers, company dial-in computers, and more!
Person 1: Hey, do you want to war dial?

Person 2: Sure, I need some hacking BBSes!
by Go_Hacking! May 20, 2009
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War dialing is scanning a range of telephones (ex. 555-555-xxxx) to find all sorts of stuff, like fax machines, carriers, and BBSes (remember this was a loooong time ago)!
Joe: Hey, I was war dialing our area code and found a hacking BBS!

Bob: Sweet! What's the number?
by Phreaking_is_not_dead May 19, 2009
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Using a port scanner to find vulnerable computer systems.
"I was war dialing the school's network and found a backdoor, so I gave myself strait A's."
by Subdermal_iPod_implantee December 17, 2006
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