Definitions by Mucho Mahs

Umpa-Lumpa 

Annoying people who are only in it for themselves, trampling their acquaintances on the way to temporary realization of their short-term goals.

“Matt snagged the chick I was into with his ‘I was a Work Shop swinger’ routine; he’s such an Umpa-Lumpa.”

Umpa-Lumpa by Mucho Mahs October 19, 2005