According to the Gheranda Samhita, Vutkrama Kapālbhātī refers to a specific internal cleansing practice (a Kriya or Shatkarma).
This technique is distinct from the breathing-focused Kapālbhātī pranayama. It aligns with practices like Jala Neti or Varisara Dhauti, focusing on cleansing with water.
Therefore, the definition matches the action of taking water through the nose and releasing it through the mouth.