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1.
Sexual practice involving felatio immediately following anal sex, usually without cleaning off the penis first
Also known as "The Libby"
by KLF February 23, 2005
 
2.
Doing ass to mouth sex is something only a complete whore will attempt and enjoy. She lets her man pound her ass in any position he wants then begs him to pull out and slide his cock into her mouth so she can taste her own ass, often repeating this several times. After he cums deep in her asshole she will suck all the cum and juice off his cock.
Kathy loves performing ass to mouth sex. She was 17 the first time a guy made her do it and shes been addicted ever since. Over the last 30+ years shes done it hundreds of times for hundreds of different men. "I dont care whos cock is pumping my dirty ass, I love to beg him to put in my mouth so i can taste it" she says. "I always rub my wet shaved pussy while im sucking him then i beg him to fuck my tight ass some more and tell him how good it tastes."
by btld October 23, 2007
 
3.
Ass to Mouth's arcane 2nd definition:
when one is contacted by one means and replies by another.

Some believe it's a little rude, but sometimes there's little alternative.
You text me.
I call you and say, "Sorry to go ass to mouth, but I'm in the car and I don't want to die."
by theduckandthegrapes October 07, 2010
 
4.
something you never do.
You never go ass to mouth
by rockthejordan September 17, 2006
 
5.
the art of cleaning your dirty cock in that sreet whore mouth!!!
God dude...I fucked this whore so hard in her gaping ass...I finished her with a good ''ass to mouth'' she got just what she deserve!!!!
by The Lord June 03, 2004
 
6.
When someone farts them immediatley throws up
Last night, my boy went ass to mouth so fast i couldnt stop laughing
by flemsauce January 31, 2010
 
7.
"One of the newer marketing ploys in pornography is called "ass-to-mouth", where the male performer anally penetrates a woman and then sticks his penis into her mouth, often joking about her having to eat shit. In this pornography the code of debasement is most stark. There is no apparent increase in male sexual pleasure by moving directly from the anus to the mouth outside of the humiliation that the woman must endure."

(Robert Wosnitzer et al, 2006, "Aggression and Sexual Behavior in Best-Selling Pornography: A Content Analysis", p. 23)
Men who enjoy the suffering and humiliation of women (="ass-to-mouth"), are diagnosed with paraphilia ("sexual deviancy" in scientific terms) according to the Diagnostic and Statistical Manual of Mental Disorders by the American Psychiatric Association and the International Statistical Classification of Diseases and Related Health Problems by the World Health Organization.
by Uncle Freud June 06, 2011