dmlm
DMLM it's an expression used in the chat-game 'No Stranger'. It means 'Death Makes Life Matters'. Adam used this secret expression who reveals his depression. This is why exactly he used this sentence after: 'If I would told you, I would have to kill you ;)'
An example of a conversation can be:

'What do you think about death?
DMLM.'
I suggest you though to not use this in this kind of situation:
'I would kill you for this.
Why?
DMLM.'