when fat women wear their pants very high you cannot tell where their fat stops and their vagina starts. this large mound of fat in between is referred to as a valump.
"look at her valump, lets makebets on how many kids she had"
adj. - curvaceous and appealing, with an implied analogy with somethingdelicious that one would want to eat - a portmanteau of 'voluptuous' and 'sumptuous'
"Dang! That woman is volumptuous! Oh, how I would love to lick every one of her delicious curves!"