look up any word, like tinder bombing:
 
1.
When your cell phone accidentally calls someone you did not mean to while on your person.
I called her a fucktard. She heard cause my phone butt dialed her.
by Laurie January 16, 2004
 
2.
accidentally dialing a cell phone thats in your pocket and the resulting broadcasting of a conversation to the last person dialed
We heard all the personal details of his blind date after he butt dialed the apartment landline.
by Roger Johansen February 12, 2009
 
3.
to accidentally dial someone's phone number by sitting on your phone, leaving a very confused person talking to your pants.
"hey man, what's up?"
(background noise)
"hello? yo, you there...? aw man. I think i just got buttdialed."

one minute later...

"hey. ... hey wait a sec. Again!?"
by vittorino June 24, 2008
 
4.
When you sit down and your phone calls or texts a random person from the movement. Usually happens at school or at the office.
George: dude why did you call me during 5th period?
Ricardo: oh sorry it must've been a butt-dial
by MyNameIsGreg March 27, 2009
 
5.
v., buttdialed, buttdialing, buttdials.

1. To phone a friend accidentally using ones buttocks. Usually this is a result of sitting on the phone.
phone rings
Person 1: hello?
Persons 2, 3, 4, and 86: unintelligible drunken noise
Person 1: Is my reception bad?
Person 86: Shit, it's person 1. You just buttdialed him. Now he knows everything!
Person 1: WHAT?! HELLO?!
dial tone
by Svati July 10, 2008
 
6.
When you pull a number completely out of your ass because some idiot just assumes that you have that person's number.
Let me just pull her number outta my ass. It'll be a real butt dial.
by John Sells T-Shirts April 12, 2011