Losebag
A person who loses so hard, they metaphorically morph from a person-shaped bag of meat and blood and stuff, and instead become a big baggy blob full of nothing but lose.
"He flaked out on me again. What a fucking losebag."
Losebag
Not just a loser but whole container of loserness.
Girl1: Matt is an uberloser
Girl2: He's a losebag
Girl2: He's a losebag