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1.
A second phone used for talking to girls beside a wife, fiance or steady girlfriend.
I just bought a Tracphone aka "a Bat Phone" from Walmart so I won't get caught by my wife talking to this chick.
de SavageNation 3 juin 2009
 
2.
A second phone used for important call only. Businessmen who get a lot of phone calls will often carry a second cell phone and only give it to certain people. Ari Gold carries a bat phone with him.
Now I have to answer the fucking batphone when it rings three fucking times and its fucking Vince.
de Entourage fan 12 juin 2009
 
3.
Your secret phone ... the one your significant other doesn't know about. Its your down-low-got-a-chick-on-the-side phone!
"Your phone is ringing."

"That's my bat phone... must be a booty call; wifey calls on the main phone!.... Hello? Hey baby. Sure, same bat time, same bat place? See you soon."
de RikkiPG 4 décembre 2007
 
4.
Noun- a man or woman you can call on short notice for a hookup, similar to a booty call. The word derives from the phone Commissioner Gordon could use to contact Batman any time of the day or night.
"I'm pretty hard up tonight. I better call the batphone."
de Dean Garrett 10 août 2005