The answer is: And I'm going to show you that it ain't no trouble when you pack double."
Colloquialism is the use of vernacular language —which is the everyday usage of a language by common people. This includes common parlance and common expressions, as you would encounter them on the streets spoken by any given person, which manifest the peculiarities and modifications to which a language is subjected, morphologically and syntactically, in a certain period of time and place.