Does any Theravada Suttas / sources refer to Oozing orifices? What are the Suttas?
The Theravada satipatthana sutta contains the same reference:


  “Again, bhikkhus, as though he were to see a corpse thrown aside in a charnel ground, one, two, or three days dead, bloated, livid, and oozing matter, a bhikkhu compares this same body with it thus: ‘This body too is of the same nature, it will be like that, it is not exempt from that fate.’


(MN 10 - Bodhi, Trans)

The Visuddhimagga explains the phrase (festering = oozing):


  The festering: what is trickling with pus in broken places is festering (vipubba).
  What is festering is the same as “the festering” (vipubbaka). Or alternatively,
  what is festering (vipubba) is vile (kucchita) because of repulsiveness, thus it is
  “the festering” (vipubbaka). This is a term for a corpse in that particular state.
  
  -- Vism. VI.3 (Nyanamoli, trans)