lump ass
When a girl has a wallet, phone, pack of cigarettes, etc. in the back pocket of her tight-fitting jeans, thus causing an odd protrusion from her butt.
Jamie: Man, if that girl is gonna wear such tight jeans she better upgrade to a smaller phone!
Christina: Yeah, shes got some seriousss lump ass!
Christina: Yeah, shes got some seriousss lump ass!
ass lump
A lump found on the ass area of the body. Usually the result of to much anal intercourse.
Jimmy has an ass lump.