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A.T.M. means Ass To Mouth. As in, your banging a chick in the ass, you pull it out and she gives you head.
Yo, that chick I took home from the bar last night, we did A.T.M.
by ItIsI November 09, 2012
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3
either at the moment, or those ATM machines in banks that you withdraw your money from.
bob: hey
fred: kinda busy atm
OR
bob: i gotta withdraw some money from the ATM machin
fred: okayy...go ahead.
by kitty_2 January 26, 2008
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4
ATM is the acrynom for "At The Moment." People usually use it during a chat conversation or email.
EXAMPLE 1:

Hola_girl: Hey, what's up?
Smiley_girl: Sorry, can't talk. Studying for a test ATM.

EXAMPLE 2:

Hola_girl: Can I come over to your house?
Smiley_girl: Sorry, I am sick ATM.
by Panda_girl April 27, 2009
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5
arse to mouth (the reason he fell in love with me:))
guy- dude she let me fuck her arse then sucked my cock straight after

guy1- wtf !!! she did atm ??? ....sweet
by nette231 September 09, 2011
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7
on the internet or through note-passing, this means "at the moment".
dad: hey, whatsup?
hannah: nothing atm, what about you.
dad: ATM OMG WHAT DOES THAT MEAN.
by hannyyy August 21, 2008
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