A person does not wipe their ass for at least one week, leaving a thin layer of shit crust. After a week, this person scrapes off the crust and allows their friends to snort the scrapings. These scrapings get the user extremely high.

when you're hungover as shit after a spending a night drunk as a skunk

noun.
a person who intakes a large significant amount of drugs on a daily basis

An absolute crackhead, who is different from everyone. Poop's in cars and ubers.