the definition in which the one being called a wood plank wench represents all that is good holy and incredibly sexy. The epitome of a wood plank wench in its finest (and hottest form) would be a girl named Emily. One look in her eyes and one glance at her amazing posterior will reduce even the most prude men into nothing more than steaming puddles of pure hornyness.
Josh: Kevin, man that girl Emily is such a wood plank wench.
Kevin: True that. Too bad im bald and ugly and fat and all i want is pussy and can never even dream of having a chance with her.