ad nauseam
adverb uk/ˌæd ˈnɔː.zi.æm/ us/ˌæd ˈnɑː.zi.æm/
喋喋不休地，令人厌烦地
If someone discusses something ad nauseam, they talk about it so much that it becomes very boring.
He talks ad nauseam about how clever his children are. 他喋喋不休地说着他的孩子们有多聪明，真是令人生厌。