by genetics only Share definition Flag When a women is very manly in mannerisms, speech, and style of clothing but is indeed a woman because of body parts. I am pretty sure Erin is the only woman who could kick my ass but she is a woman by genetics only. by genetics only by blitzone April 24, 2008 0 0 Get merch Get the by genetics only mug. Buy Now — $32.95 See more merch