Cleaning out a bowl from a pipe. Either because the person before couldn't bong it, or the ash gets stuck in a pipe and needs to be cleaned, therefore ashing it.
I am not going to cash it when it is already burned. Just ash it out so we can pack a fresh one.
It means that you are notinterested in or worried about something or someone; that you place no value on something, an event or a person; that you do not care and are uninterested. It means that you place less value on it than you do on a turd, says it all really.
When you really really want to emphasize that no one cares about something. Not only does it feel satisfying to say, it's a quick and easy way to shut someone down when they say something stupid or trivial.
An overwhelming amount of work, studying, research or homework. At the beginning of the task, it seems almost impossible to complete. Some how you finish just before the deadline. Sleep deprivation and a need for caffeine are common side effects.