Crying while laughing: shedding tears while laughing, often from strong amusement, emotion, or joy (used as a noun; can take する).
彼のスピーチは面白くて笑い泣きしてしまった。
His speech was so funny that I cried with laughter.
赤ちゃんの様子に母親が笑い泣きする場面をよく見る。
You often see mothers crying with laughter at their babies' antics.
感動的な映画で観客の中には笑い泣きする人もいた。
At the moving film, there were people in the audience who laughed through their tears.