Noun, verb, whatever you see fit.
A simple 2-step maneuver preformed while drinking to test one's level of drunkness.
Step 1. Shake head
Step 2. Evaluate how drunk you are by how long it takes your surroundings to stop spinning.
Goal: keep them spinning!
Shit. After all this rum, I just had to (do a) shake test to make sure I could type this right.