Get your mind out of the gutter. Ejaculations -- also called aspirations or invocations -- are very short prayers. Many come from Scripture. Here are some ejaculations:
God, have mercy on me, a sinner!
Blessed be the Name of the Lord! (Reparation for blasphemy)
O Heart of Jesus, burning with love for us, inflame our hearts with love for Thee.
My Lord and my God. (John 20:28)
Jesus, Mary, and Joseph.
Jesus, Mary, Joseph, I give you my heart and my soul. Jesus, Mary, Joseph, assist me in my last agony. Jesus, Mary, Joseph, may I sleep and rest in peace with you.
May the Most Blessed Sacrament be praised and adored forever.
Stay with us, O Lord. (Luke 24:29)
Mother of Sorrows, pray for us.
My Mother, my Hope.
Hail, O Cross, our only hope.
Merciful Lord Jesus, grant them everlasting rest.
Blessed be God!
Jesus, meek and humble of heart, make my heart like unto thine! (Roman Ritual)
My Jesus, mercy!
O Mary, conceived without sin, pray for us who have recourse to thee! (The Miraculous Medal prayer)
Sacred Heart of Jesus, I trust in Thee!
Sacred Heart of Jesus, Thy kingdom come!
Sweet Heart of Jesus, be my love!
Holy Trinity, one God, have mercy on us!
From all sin deliver me, O Lord!
Jesus and Mary, we love you, save souls!