Almost always paired with a noun for smell or liquid: 香气四溢 'fragrance fills the air,' 油光四溢 'glistening with grease.' Rarely stands alone — treat it as the second half of a fixed pattern X 四溢.
memory
四 = four (directions), 溢 = overflow. Picture something overflowing toward all four directions of the compass — north, south, east, west — at once.
