When someone is being an extremely large downer, and is complaining, therefore ruining everyone elses good time as well. Can be elaborated on by adding statements such as "Stop eating all the fun" and "Why do you have to eat all the good-time that exists in this room?"
Can also happen when the person is not saying anything but just acting extremely mopey and not contributing to the conversation.
Girl: "This party is so lame. I'm so hungry and the music here sucks. We should leave. Aren't you hungry? Don't you think tonight was crappy?"
Guy: "God stop being such a downasaur and eating everyone else's good time!"
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!
The product of mixing Hashish with a fine middle eastern pipe tobacco known as Doha. Usually smoked through the Doha pipe. it is a common custom amongst Dohash smokers to name their pipes.