Its from a kid cudi song!
...I was close to go an try some coke
and a happy ending would be slitting my throat,
ignorance the coke man, ignorance is bliss,
ignorance is love and I need that sh**...
ignorance the coke man = Ignorance is his coke man selling him what he needs to get his fix.
ignorance is bliss = Common phrase Not knowing something is usually better than knowing it.
ignorance is love = If ignorance is blissful, Then he loves it, kuz it loves him back (what you don't know won't hurt you)
I need that sh** = a junkie tellin the coke man I need that Shyt
perhaps he means that being ignorant to one's partner's unfaithfulness can let the love for each-other continue.
i guess its the same as ignorance is bliss
look it up cuz i aint explainin tht ish