Allow me a moment of whimsy. We need an anti-brexit anthem and I think Pete Seeger had it in spades (for "big fool", read "brainless brexiteer")*:

Maybe you're still walking, you're still talking,
You'd like to keep your health.
But every time I read the papers, that old feeling comes on,
We're waist deep in the Big Muddy
And the big fool says to push on.

Waist deep in the Big Muddy,
The big fool says to push on.
Waist deep in the Big Muddy,
The big fool says to push on.
Waist deep, neck deep,
Soon even a tall man will be over his head.
We're waist deep in the Big Muddy,
And the big fool says to push on.

*...Or Theresa May if you like...