Hey, justicewifey, My pastor uses that term all the time. I believe he is referring to one of the many postures used in prayer referred to in the Bible. I believe David laid on his face all night hoping that God might show mercy to him and Bathsheba's deathly ill baby. It is a prayer posture of ultimate humility and resignation to God's mercy. At times when I have been greatly burdened abt a life situation I might lie down or pray directly on the floor on my stomach face toward the ground. God has heard and answered many of these situations which threatened to undo me. One great way to show God just how serious you are abt something.