a weird guy on youtube who attempted to break the world record for kicking his head over and over again. his videos are special, meaning "brain draining".
p1: " hey did you see the new deathmatter56 video?"
p2: " yeah, it sucked."
More often than not described as the last exhale of breathe, heard from the vibration of the neck when it is in an unusual position, allowing air to escape a narrow passage from the throat. It causes any of infinite odd sounds of expulsion of air.
You can imitate a deathrattle for fun. Lean your neck backwards at 90 degrees and Pronounce terms such as "Ughrghrghrghrgh" or "Phhztttttt"