As an actual man from Nantucket (though not that one) lemme fill you in:

There once was a man from Nantucket,

Whose dick was so long he could suck it.

He said with a grin,

As he wiped off his chin,

"If my ear was a cunt I would fuck it."

There are a metric fuckton of limericks that start with that phrase. A common one is:

There was a young man from Nantucket
Whose dick was so long he could suck it.
    He said with a grin
    As he wiped off his chin,
"If my ear was a cunt I would fuck it." 

I know a different version from the other two:

There once was a man from Nantucket

Who put all his shit in a bucket

And one day he tripped

And the bucket, it flipped

And he said “ah well fuck it”