КАПАТЬ НА МОЗГИ (кому) slang, disapprov e?subj: human to assert sth. over and over to s.o. , repeating it continuallyto admonish s.o. endlessly
X капает Y-y на мозги — X is (getting) on Y's back (case)
X is pestering (bugging) Y.
«Он тут... нам на мозги капает, а ты и вздыхаешь: вот, дескать, божий человек. А этот божий человек небось ряху наел» (Абрамов 1). "Here he is getting on our backs, and you just sigh and say, There's a simple man of God.' Well, this man of God managed to stuff his face pretty good" (1a).