"Bertha Butt Boogie" by Jimmy Castor Bunch. Low? Vulgar? Whatever, it's fun and has its place.

original 45:
Bertha Butt Boogie / E-Man Boogie [as The Jimmy Castor Bunch]
Artist Jimmy Castor
Type Single
Released 1974
and a bouncy comp from the good folks at Rhino, back when Rhino mattered:
do the bump, boogie Bertha, do your thing:
[youtube]http://www.youtube.com/watch?v=QaUUK2_ED70[/youtube]