I remember when I had that "problem" with Christmas songs. I would be exposed to them during the season, and they would pop up in the middle of the summer, and even close to time for them to start again. And I would try and block them out. Needless to say, they never quite got down to zero.
I suspect this is the same with Kingdumb S***. From time to time, they pop up. Whether they are set off by seeing a few of the lyrics or by hearing something that resembles the original song, it is a nuisance. Most likely, it is the times I would go to the boasting sessions. I remember listening to them at home on occasion (they wanted me to listen to it in place of music, but I only listened to it occasionally such as to help me to sleep--in which they did a p*$# poor job). And there were the big boasting sessions, where of course they are more memorable since you only hear them in that setting a few times a year.
However they got in, I suspect they are in for keeps. And when it happens, I remember the Christmas songs that I used to not supposed to be thinking of, and know that it can fade out but not die totally. I no longer have any of that s*** in my place (I destroyed the records and erased the tapes, and never bothered to order the CDs). I do what I used to do about the Christmas songs--I generally have real music going in my computer (including a few Christmas songs). And, of course I have to be careful not to be indoctrinated by the lyrics: if you are really tired and the lyrics are coming in clear, it may still be possible to autohypnotize yourself and auto-indoctrinate yourself with the s***. That is the real danger of listening to it.
If I never hear another piece of that Kingdumb S***, it will be too soon.