A scientific measure of pressure equivalent to about 14.6959488 pounds per square inch. Abbreviation for "atmosphere." Its is a measurement of how much pressure the atmosphere exerts on an object at sea level (where the pressure would be 1 atm).
There is 2.5818 atm of pressure on that balloon, causing it to shrink from its original size when the pressure was 2 atm.
by DragonFyre September 15, 2005
Get the atmmug. 
by theboss December 23, 2003
Get the atmmug. a) (apples that melt): valuables left ''unattended", especially food , consumed in the blink of an eye by other family members, left on your kitchen table
b) (assholes that matter): teachers in high school you absolutely hate, but whose class you must absolutely take, and pass, in order to graduate.
b) (assholes that matter): teachers in high school you absolutely hate, but whose class you must absolutely take, and pass, in order to graduate.
by Sexydimma February 28, 2015
Get the atmmug. Ass to Mouth means person A is fucking the ass of person B. Person A removes cock (prior to cumming) from ass and inserts in mouth of person B.
by Anon April 6, 2004
Get the atmmug. Ass-To-Mouth
When a man -or- a woman with a strap-on fucks a woman -or- a man in the ass, and then immediately puts the penis -or- strap-on into the woman -or- mans mouth without cleaning it first.
When a man -or- a woman with a strap-on fucks a woman -or- a man in the ass, and then immediately puts the penis -or- strap-on into the woman -or- mans mouth without cleaning it first.
As a straight couple:
Dude, I gave my girlfriend ATM yesterday and now there are weird sores on her mouth!
As a gay couple:
Like, I totally like fucked my boyfriend in the ass yesterday then like stuck it in his mouth, it was like hawt.
As a FemDom couple:
My husband took my dirty strap-on in his mouth yesterday after I fucked him in the ass. He loves it when I give him ATM, that little bitch.
Dude, I gave my girlfriend ATM yesterday and now there are weird sores on her mouth!
As a gay couple:
Like, I totally like fucked my boyfriend in the ass yesterday then like stuck it in his mouth, it was like hawt.
As a FemDom couple:
My husband took my dirty strap-on in his mouth yesterday after I fucked him in the ass. He loves it when I give him ATM, that little bitch.
by FemDom Bitch September 25, 2007
Get the atmmug. So, are ATMs really just a bit of twatting about on the floor in the hope you'll be less of a tit?
Yeah, i guess that just about sums it up!
Yeah, i guess that just about sums it up!
by HollaBackGirl2 January 7, 2008
Get the atmmug.