“Butt dial” and “booty call” are not the same thing, but the terms have been combined on several images. “If you butt dial someone is that considered a booty call?” was posted on Twitter on September 11, 2009. “I think that a butt-dial is a polite form of booty-call” was posted on Twitter on April 1, 2011.
 
     
Wiktionary: butt dial
Noun
butt dial (plural butt dials)
1. (colloquial) A situation when one’s cellphone makes a call from one’s back pocket where its buttons are being inadvertently pressed
 
Wiktionary: booty call
Etymology
Coined early 1990s, attributed to Bill Bellamy on Def Comedy Jam.
Noun
booty call (plural booty calls)
1. (informal) A telephone call to request a sexual encounter.
2. (informal) A sexual encounter arranged by telephone.
3. (informal) The recipient of a telephone call requesting a sexual encounter.
 
Twitter
Glen Weldon‏
@ghweldon
The term “butt-dial” does NOT, in point of fact, mean the same thing as “booty call”. But if we strictly interpret Roget’s, it so should.
11:21 AM - 4 Mar 2009
 
Twitter
Moltz‏
@Moltz
Booty call - that’s when you put your iPhone in your back pocket and you accidentally butt-dial someone, right?
1:27 PM - 16 Apr 2009
 
Twitter
Matthew Libby‏
@mattclibby
If you butt dial someone is that considered a booty call?
1:09 AM - 11 Sep 2009
 
Twitter
numberjohnny5 ❄️‏
@numberjohnny5
If you butt-dial someone, is that a booty call?
9:50 AM - 5 Oct 2009
 
Twitter
Lady‏
@TeAmo_Daniella
I think that a butt-dial is a polite form of booty-call
3:18 PM - 1 Apr 2011
 
Funny Status
I think that a butt-dial is a polite form of booty-call.
March 19, 2013 Phone Status Updates
I think that a butt-dial is a polite form of booty-call.
 
Reddit—Shower Thoguhts
There’s a big difference between a “butt dial” and a “booty call” even though the words are interchangeable
submitted December 14, 2014 by JustForBrowsing
 
Twitter
Cole M. Sprouse‏
@colesprouse
Butt dial your booty call
6:52 PM - 22 Jun 2016