Referring to the unfortunate scenario when you receive a phone call from a friend's cell phone only to find out that their butt accidentally called you. Also known as a Butt Dial. The greatest result of this is when listening to your voicemail for about five to ten minutes while nothing is said in the message.
-"Dude, you booty called me last night!"
-"I'm sorry bro, my touch phone has a mind of its own when its in my pocket."
-"Maybe you shouldn't keep it in your butt pocket...by the way, when did you decide to be gay?"