My thoughts will have blood on them

It means that you'll be able to do more then what you're doing right now. That you'll fight back amd not stand in fear. You'll have people behind you and not be scared of the “ifs” or the “whats”.

The blood is of the person you're talking about. Their blood on your thoughts.

The thoughts part is like when you have this gruesome thought of a gruesome idea, or not even gruesome just payback, or maybe just a meeting. The point is it's a thought that will satisfy you and allow you to move on. It'll be something you forget about but remember and still wanna do.

And im the one who made this phrase so- I hope its worth it-