combination of ass and nasty. When just one won't do, both have an overall

a combination of ass and nasty, could even be pronounced basra’s if you’re feeling risky.

A combination of the words Ass and Nasty, used in place or emphasis of the adjective "Nasty Ass."

That nastiest person you can think of Jack! and something that is horribly fucked up or completely disgusting that it makes you vomit thinking about it or dropping dead looking at it.

The opposite of the early bird gets the worm. When you are last, you get ass.

See also, “you snooze you lose”