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I figured everybody knew it!

There once was a man from Nantucket
With a pecker so long he could suck it
He said with a grin
As he wiped off his chin
If my ear was a cunt I could fuck it!

Well now I know! Pretty sure I've heard other variants on the Nantucket - fuck it theme as well ;)

I thought everybody knew...I'm 71 and it was an old joke when I was a kid!