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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!
by Nathan T April 01, 2008
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Any one who uses his or her ass to confine charcoal in order to prevent people from stealing it.
My charcoal is in my lumpass, you cant have it.
by James F. Casey December 30, 2003
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