Machen Share definition Flag Machen is a bodacious babe who has big boobs with a bubbly personality; Machen is far from a bimbo with her brainiac like brilliance. Everyone wants to break it down and be with a Machen. “Man that guy is so lucky he landed Machen, that bitch is banging” Machen by Machbabe July 9, 2014 Get the Machen mug.