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1.
Term used to describe anyone whose job it is to manually handle freight in a warehouse. This job usually entails use of powered equipment, but specifically refers to what drivers call 'finger freight' freight which requires some manual handling.
I delivered to a shit hole grocery warehouse and they didnt even have any lumpers to hire.
de SirDiesAlot 22 avril 2008
 
2.
Big-rig trucker jargon for a person hired to travel with the driver for the purpose of helping to load and unload the cargo container.
The guy is a gypsy of sorts, and finds occasional work as a lumper at truck stops across the nation.
de Etch 12 décembre 2007
 
3.
Noun. A gay man who will unload a trucker's delivery in exchange for sexual favors.
The trucker didn't have a lot of time to spend unloading his haul, so he gave he lumper a blowjob so he would unload the trailer more quickly.
de El Duce 6 novembre 2004
 
4.
cute in a completely platonic and unconventional way.
PERSON1: Do you think he is cute?
PERSON2: Yeah, in a lumper way.
de valenciaroolz 23 juin 2007
 
5.
A person who "lumps" you into their email distribution lists when sending jokes and other viral email messages. In most cases you barely know the person who sends you the email or they are just a friend of a friend of a friend.
Lumpers are poeple who "lump" you into their distribution list when sending jokes and other viral email.
de Susana Avila (MK) 6 février 2009
 
6.
Circa 2003, Frederick, MD. A lumper is when you pass-gas only to have the excretion interupted by an unexpected turd.
Tim was so excited that he went to pass-gas, and to his suprise, felt a "lumper".
de KMA 9 décembre 2004