A derogatory term taken from the famous DJ Norman Cook's preferred stagename, Fatboy Slim. Cook being quite a thin character, it's obvious the derogatory term is an inverse of this, directed at obese people.
Verb, to slimjohn is to eat something so quickly it seemingly never touched your tounge. The phrase "double slimjohn" originated when people started to slimjohn so fast they regurgitated and slimjohnned again. The record is a quadruple slimjohn.
There is also a tournament going around called the Slimjohn championship. This is where people compete to see how quickly they can quadruple slimjohn a loaf of bread. The record is currently held by a Competitor, known by the alias of Kirill17.
Toaster: Hi have you seen my friend James he can slimjohn 14 pizzas within 10 minutes
Kirill17: That is nothing compared to me. I am an immortal Slimjohnner.
James: I bet I could beat you in the Slimjohn Championship, I can quintuple Slimjohn
A slum dweller.
A person who lives in a poor makeshift locality in extremely dirty conditions like a stray dog.
A person who lives in an overcrowded and poor area of a city in which the housing is unplanned.
1. That bastard slumdogs put a scratch on my BMW.
2. Every Slumdog dreams of becoming a millionaire; but destiny chose just one out of millions.