The Greek verb gemō (γέμω) means to be full or to overflow with something. Unlike gemizō (to fill), which describes the action of filling, gemō describes the resulting state of being completely full. It is used of cups, tombs, and the living creatures of Revelation.
Gemō appears in Matthew 23:25-27 in Jesus's withering critique of the Pharisees: 'You clean the outside of the cup, but inside are full of (gemō) greed and self-indulgence.' And 'You are full of (gemō) dead men's bones and everything unclean.' The contrast is between outward religious performance and inward reality. The question God asks is not what we appear to be filled with but what we actually are filled with. Being filled with the Spirit (Ephesians 5:18) is the divine answer to the human tendency toward self-filling.