More of a penis than a pelvis. Elvis the pelvis is usually a reference to your penis while accompanied by hip motions likened to that of Elvis. Also can be used if you like to name your penis.
JhiroJhizo : Back in biology class in high school when on the topic of reproduction my teacher would always take time out to refer to Elvis the Pelvis, considering thats what most of the class was interested in anyhow.
Neptuneman674 : o.o