Pretty stiff competition. Among others: "We Built this City" (1985), which has that one line of gibberish--Marconi plays the mamba--which is repeated over, and over, and over again, but which otherwise is coherent.
On the other hand...Jimmy Webb claims he wrote MacArthur Park based upon what he actually saw in MacArthur Park that day. Jimmy Webb had to have been on LSD then. Really, the lyrics are like they were written during a bad trip. They never make sense. Richard Harris didn't have much of a voice but I have always thought his voice worked in that song. Harris was a Brit and so he was not so familiar with Los Angeles. He mispronounces MacArthur Park as MacArthur's Park. But why quibble? The tune is fine...until it goes schizoid with that instrumental. But why rearrange deck chairs on the Titanic? It is the lyrics, the lyrics, they and they alone that make MacArthur Park THE Worst Popular Music Song in the Whole History of Earth.
Spring was never waiting for us, girl
It ran one step ahead
As we followed in the dance
Between the parted pages and were pressed
In love's hot, fevered iron
Like a striped pair of pants
All the sweet, green icing flowing down
'Cause it took so long to bake it
And I'll never have that recipe again
Oh no!
Foaming like a wave
On the ground around your knees
The birds, like tender babies in your hands
And the old men playing checkers by the trees.
For I will sing it
Someone will bring it
And never let you catch me looking at the sun
After all the loves of my life
You'll still be the one.
And my passion flow like rivers through the sky.
Oh, after all the loves of my life
I'll be thinking of you