Very much so ... it has been prodding the grey cells ever since I read it in your post ! LOL
Seems to describe "onomatapaically" a temporary disturbance from a source external to a resonator which somehow affects the internal resonance for a possibly limited finite period (read ...clouting someone with a guitar or similar) .
Mathswise, the resonation would have a total (sigma) sum of zero but only after the entire event has expired (maybe have to substitute the guitar for a piano to ensure expiry...LOL).
Nuff bollocks for now!
Cheers