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lose bag 

noun a person who has no real friends their own age and therefore hangs out with their kids friends or their siblings friends (not to be confused with a pedophile, milf, cougar or a douche bag, though loser may be an acceptable synonym)
Steven graduated with me in the 90's but he goes skateboarding with my little brother who graduated last year, he's such a lose bag.
lose bag by db8dork November 29, 2010
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 by Kylasaurus January 10, 2012
Not just a loser but whole container of loserness.
Girl1: Matt is an uberloser
Girl2: He's a losebag
Losebag by Borg December 8, 2004