Navel, bladder, intestines, anything that is under pressure and leaks when you burst it (tyres, balloons, pimples, waterbags, etc.).
The noun root -tyirri- can occur inside the complex verb immediately before the verb root, where it can convey meanings ranging from literal to metaphorical.
Kurungurr Example:
Deyedirr yeniny tyirritu nginde.
The car tyre has punctured on me.
Kurungurr Example:
Wamanggal wunni tyirritu tye.
They were gutting wallabies.