Somebody who is rude and loves to hurt peoples feelings. Most people hate lumpatious people. People who are lumpatious are usually full of themselves and think that they are above everyone else.
Girl : I really hate that guy!!
Boy : Yeah everyone does... he is so lumpatious!!!
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.