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1.
A turtle balanced on top of a fence post
While suturing a laceration on the hand of a 70-year-old Texas rancher (whose hand had caught in a gate while working cattle), a doctor and the old man were talking about George W. Bush being in the White House.

The old Texan said, "Well, ya know, Bush is a 'post turtle'."

Not knowing what the old man meant, the doctor asked him what a post turtle was.

The old man said, "When you're driving down a country road and you come across a fence post with a turtle balanced on top, that's a post turtle."

The old man saw a puzzled look on the doctor's face, so he continued to explain, "You know he didn't get there by himself, he doesn't belong there, he doesn't know what to do while he's up there, and you just want to help the poor stupid guy get down."
by Pinko_Commie May 06, 2004
 
2.
*Australian definitive example.
Post-turtle

While stitching up the hand of a 75 year old Queensland farmer, who got cut on a gate while working cattle, the rural doctor struck up a conversation with the old man. Eventually the topic got around to Kevin-07 and his appointment to Prime Minister of Australia.

“Well, ya know,” drawled the old farmer, “this Rudd fella is what they call a fencepost turtle.”

Not being familiar with the term, the doctor asked him what a fencepost turtle was.

The old farmer said, “when you’re driving along a country road and you come across a fence post with a turtle balanced on top, that’s called a fencepost turtle.”

The old farmer saw a puzzled look on the doctor’s face, so he continued to explain,

“You know he didn’t get up there by himself, he definitely doesn’t belong up there, he doesn’t know what to do while he is up there, and you just gotta wonder what kind of dill put him up there in the first place!
by Tallara July 10, 2008