The female version of "balls". Meaning very courageous or sometimes foolhardy. For example - "Damn that guy's really got balls to piss on that cops leg." As you may have noticed, women are not born with balls but instead have the feminine gonads, ovaries. "Ovaries" do not have the same inspiring ballsy sound as "Balls", hence feminads.
"If you had any feminads at all you'd knee that guy in the nuts the next time he puts his hand on your boob."
"Barbara Boxer has awesome, Senate sized feminads."