Bustin Hump 

To bustin a hump means to work hard

I've been out all day bustin hump

Bustin Hump by Jaoibh October 17, 2008

busting a hump 

Putting in extra time and effort to accomplish something (like a chore, special project, or other task).

Thanks for busting a hump today to get that project done, Carl.

busting a hump by Chiljazzer September 8, 2006