Floorboard muncher Share definition Flag A person who provides oral sex to a younger girl, particularly below 13 years old. Derived from 'rug muncher' but becomes floorboard due to the girl having no puibs. jack in 4th year is going out with jill in 1st year, jack is a floorboard muncher. Floorboard muncher by D-mass November 29, 2009 0 0 Get merch