A male partner in a romantic relationship; the counterpart to 彼女 (girlfriend).
週末は彼氏と映画を見に行く予定です。
I'm planning to go to the movies with my boyfriend this weekend.
彼氏は料理が上手で、よく手作りの夕食を作ってくれる。
My boyfriend is good at cooking and often makes homemade dinners for me.
彼氏にサプライズでプレゼントを渡した。
I gave my boyfriend a surprise present.
A colloquial, jocular way to refer to 'he' or 'that guy' (used playfully in casual speech).
彼氏、今日も遅刻かよ！早く来いよ。
Hey, he’s late again today! Hurry up and come.
あの彼氏、こだわりが強くて面白いよね（冗談めかして）。
That guy's really particular—it's kind of funny (said jokingly).