the medicine you digest so well lately

an negative and anti-social habit one has recently acquired.

mother: Joseph, stop interrupting. I don't like that, that, whatever, what yumma call it, the medicine you digest so well lately. This anti-social habit won't get you anywhere in life. And Joseph, also please improve your vocabulary. I didn't raise you to such a rotten apple

Joseph: go scratch yourself. I will not stop interrupting, just because you want me to.