A frump-a-lump is quite a large, obese chick, one comparable to the size of a cow (rule of thumb), and is quite grotesque in nature. One also possesses behaviours that are quite foul, disgusting and somewhat off putting. You might go as far as saying a frump-a-lump is the perfect mixture between a frumpy and a heffer. Frump-a-lump's can be found across all demographic areas, ranging from lower, middle and upper class. Although most are quite prominent in Low Socio-Economic Status areas such as Dandenong and Croydon.
Danny - "dude, i copped some fat head this morning!"
Sean - "Sweeeet, was she mint?"
Danny - "Nah, i woke up, grabbed the paper, sat down on the shitter, and before i knew it a frump-a-lump was giving me a fresh frumpy! I didn't aven have to ask!"
Sean - "Oh dude, that sucks, was she from McRob?"
Dannny - "Yeah"
Sean - "Sweet!"