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1.
A person that is so worthless you would contemplate hanging out with a sack full of doo doo rather than be around them. A person that constantly needs to be reminded that they are worthless because they do not realize it.
Damn- i need to get outta this party, all I see are dumpsacks.

We had to cut that kid from our team, he was such a dumpsack.
by c.harris April 20, 2011
 
2.
A sack of weed that is both skimpy and poor quality...and smashed. Derranged from the term "skimpsack".
An example of a dumpsack would be weed you buy from some cracked out wierdo who calls the weed "dense", but is just smashed from them sitting on it.
by Jasmine Kela June 23, 2008