'Strictly for the birds' is an old expression. I'm not sure what it means. I think it means 'for fools', but I'm not certain. What exactly does it mean and where does it come from? Thanks.
It started life as USA slang for 'trivial' or 'worthless'. The earliest recorded example of it is in J D Salinger's 'Catcher in the Rye', published in 1951. Back then, in US Army terms, it was taken as a reference to the fact that birds often ate - or at least pecked at - animal droppings. I'm sure I don't need to translate that into the equivalent short word we'd probably use nowadays in British English. Thus, anything that is 'strictly for the birds' is - - - -!