1 definition by mustang-wolf
A hardened ball of male excretion produced usually a few hours after an improper ejaculation, one usually needs to see a physician after producing a fuck-nugget, as it is extremely difficult to expell from the penis.
Person 1: "Did you hear about John? He claims to have gotten a fucknugget!"
Person 2: "Oh my god, I hope he's okay!"
Person 2: "Oh my god, I hope he's okay!"
by mustang-wolf December 3, 2012