fed up with hearing something repeatedly
Abbreviation of 耳に胼胝ができる (literally 'to get a callus on one's ear'). Used when someone has heard the same thing so often that they are sick of it. Colloquial and idiomatic.
See also: 耳にタコができる (みみにたこができる)
I'm fed up with hearing 'Study!' all the time.
I've heard that story so many times I'm sick of it, so please stop.
Common colloquial spelling using katakana for タコ.
Hiragana variant; less common than 耳タコ but still seen.
Rare kanji form using 胼胝 (callus); it is rarely used.
Clipped form of the idiom 耳に胼胝ができる (to get a callus on one's ear), implying that hearing the same thing repeatedly is as irritating as a physical callus.