(adjective) 1. Tired, sleepy, unable to carry on.

etymology- Thought to have first been used during the Dark Ages. Upon surviving an attack from a fire breathing lizard, the last image you would witness before passing out from lack of blood and multiple contusions would be the "Dragon's ass", as it flew away into the night.

1. Tired. 2. As if to be so tired that one's own ass is a burden to carry.