codswallop /ˈkɒdzwɒləp/. slang. Also cod’s wallop.
Etymology: Origin unknown.
Nonsense, drivel.
1963 Radio Times 17 Oct. 52/2 ― Just branding a programme as ‘rubbish’, ‘tripe’, or-there are a lot of these-‘codswallop’, gives little indication of what moved the viewer to write.
1966 J. Porter Sour Cream vi. 72 ― It had all seemed a load of old cod’s wallop to me at the time, but those lecturers were experts.
1966 A. Prior Operators vi. 64 ― All that stuff about mutual respect between police and criminal was a load of old codswallop.