If you say that you are in ~, you mean that you are in a state of complete happiness. (INFORMAL)
N-UNCOUNT: in N
If you say that you are in ~, you mean that you are in a state of complete happiness. (INFORMAL)
N-UNCOUNT: in N
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012