A fucker who's nuts dropped when they were 24. An absolute nonce of a human being and are the tool's of this earth. Often associated with douche bags who need to grow up.
"Hey John, i heard Jay's dating a 17 year old "
"Oh my god, that guys a total fucknut"
A person who is so dumb that words cannot describe how dense they are: therefore, the term "fucknut" was created. They also have a maximum of -50 brain cells, somehow.