To make a prediction or extend a line of thought toward a conclusion based on uncertain or insufficient information.
Since there are so many planets like earth in the universe, there must be other intelligent life, but I'm just guesstrapolating.
I can only guesstrapolate that given her history of blunders and her ignorance of history, the Constitution, and geography, Sarah Palin could never be elected president.
They say serial killers have a history of animal abuse, fire starting, and bed wetting, but that's really only guesstrapolating
Isn't everything just guesstrapolation?