No Man Breathing...?

I have had weird dream this morning. No, not last night, but is this morning.
I dream that I went to my best friend house with my boyfriend for her birthday party. When we reach there, we were chatting with my friend's parent.
We were sitting on the couch when we were chatting.
Then, my friend says that she want to introduce her boyfriend to us as her boyfriend reach already with his another friend.
At first we were surprise with her announcement, but then we were excited over the news.
We quickly asked her to show us her boyfriend.
She then walked out from her living room and soon after she came in with two boys and then she introduce one of the boy as her boyfriend.
Right after he say hi to her parents, he then sit down on the couch without saying anything.
To my surprise, her parent says that her boyfriend is quite rude as he should come into the house himself and introduce himself. Then if next time want to go to their girlfriend house to meet their parent for the first time, DON'T act like this. It is a no man breathing things. I don't understand what does it mean so I asked what is that meaning. Her mum told me, "you kill into your heart with your heart".
I was like, Huh? Blur...
When I awake, I search high and low for that meaning "No Man Breathing" and also "You Kill Into Your Heart With Your Heart".
Hell, I can't find any. Wonder, what does it mean...