Used to describe a skunk. Nocturnal animal that sprays ass gas to defend itself, one of its main characteristics is a white line on its back. Scoonstache is commonly confused with Coonstache when heard.
A confident explanation one would give when asked how much longer a task may take even though in reality the person has no clue how long it might actually take.
When we asked our mechanic how long until our car would be ready he replied "soonatarily".