a. A turtle that can sometimes be seen on top of a tall pole in the Midwest. When you see a turtle on top of a tall pole, you think:
Well, you know it didn't get up there by itself.
It must not know what to do now that it's up there.
And what asshole put it up there in the first place?
b. Can refer to a person similar questions can be applied to.
Tim: Wow, Sara Palin's an idiot.
Alex: Yeah, she's a total pole turtle.