These Lumps is sung by Lumpy Space Princess. Considered to be a parody of "Lady Lumps" by the "Black Eyes Peas." It was stolen by the other candy people contestants, which two of those contestants was Lollipop Girl and Chocoberry. When LSP sung it after the others stole the song, people got angry with her. The song was sung at the talent show in the episode "Five Short Graybles."
I know you wanna slump
But you can't cause you're a chump!
So just go back home, back to your duuuuuuuump!