“ You Knew what i was when you picked me up.”

What this quote means is that you need to be careful of what you do like if you try drugs and end up messing your entire life up the drugs are gonna look at you and say you knew what i was when you picked me up so this is saying whenever you try something knew always take it in my that if you do something your not suppose to and you end up dead or crazy you are gonna look at it and it’s gonna tell you knew what i was was when you picked me up.