A fork of Rural Dictionary
To be downass is to be more down than down. If someone who is down is "with it", a person that is downass is even more "with it". This is one step below "down as fuck", but a step above just regular "down".
You bought Brandon Call of Duty Black Ops?" "Yeah..." "You're a downass mofo!
A laid back, down to earth woman who can be defined as "one of the guys" or someone who gets along with manly subjects. She also has an insatiable affinity for just about anything sex related.
Wow, dude! She blew you while you played Call of Duty? That's one bad downass bitch!