Thoughts or actions based purely on the intellectual bias of a man. Such thoughts are intensified by the consumption of alcohol; Mantellect occurs most regularly in the fields of navigation (road or otherwise), and physical exertion.
"Mate, how come it took you so long to get here?"
"Oh, I just navigated using my mantellect."
"Mantellect would suggest that having a heavy drinking session before running a marathon in the morning a great idea."