atdm 

ATDM is short for arse to different mouth.
it is a variation for the more commonly used term "ATM".
which is arse to mouth in porno's.

Basically it involves you shafting a birds arse, pulling out and putting your cock in her mates/sisters/mothers mouth.
Hence the abbreviation "ATDM"
i.e-- ive just done a bit of atdm, with that slag and her mate i met in tantra.

atdm by Dirty Burty and wheat July 14, 2007

ATDM 

Acronym, stands for Activate the Dick Machine. Typically necessary to shout when drunk and normal dick machine activation seems to be delayed.

I’m drunk and need a piece of ass, “ATDM!!!”

ATDM by Anonastic January 2, 2021