Something that doesn't make sense and sounds like utter nonsense can be described as codswallop, also, in some places of devon, there are cults that use the walloping of a cod as a method of induction into their sect...
That's just utter codswallop you pillock or Is thou ready for the codswallop young initiate?!?
A shitty tattoo done by a scratcher tattooer made good by blagging (lying) about their credentials to the unsuspecting public, and making them believe that a) they are a real tattooer and b) that it is a good tattoo
Dude, where did you get that tattoo?
I got it at (name any crappy tattoo shop in any crappy town)
Hell, man, that ain't nothing but codswallop slop