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1.
1. The demand of a faster pace or to get moving
2. To make Haste or Godspeed
3. To get shit done
Usually said to someone who may display qualities of sluggishness or lack of motivation.
EX. 1 Hey idiot you better get humpin' that bear isn't done chasing you yet!

EX. 2 You better get humpin' if you want to get this done early
by Dr. Lambchops March 31, 2008