This is a whistle technique that wavers from a high tone to a lower tone in rapid succession like a wavering siren.
How it's done
- Think of Patrick Star from Spongebob saying "leedle leedle leedle lee"
- Whistle inward while the tongue touching the roof of your mouth (alveolar ridge)
- While inhaling, change the strength of the air flow. The stronger your suck inward and the tighter you keep your lips, the higher the pitch will be
