(colloquial) Very stupid; brain-dead.

A reminder that we are all mortal, as a justification for enjoying life while one can.

A soft coral (Alcyonium palmatum).

Alternative form of dry as a dead dingo's donger

(acoustics) Describing a control room of a recording studio in which one end is damped to absorb sound reflections

with much doubt and skepticism

(idiomatic) A statement that one will not allow something (most often a firearm or other weapon) to be taken away from one's possession until after one's death. A variant, from my cold dead fingers, is most often used in the US by gun rights advocates.

comparative form of dry as a dead dingo's donger: more dry as a dead dingo's donger

It is better to arrive late than to risk your life speeding to a destination.

Alternative form of dead men tell no tales