1. (n) (RAH-dih-kahns) The act of leading others to believe one's penis is not what it actually is. The instigator may imply that it is bigger, smaller, wider, narrower, shaped differently, circumcised, un-circumcised, etc.- when it is actually to the contrary.
"He told me he had a huge dick, and I believed him- but I was simply a victim of his rodicons."
(n) Someone that somebody hooked up with that was not attractive and/or rude and generally untolerable. In other words: someone that makes people say "whhhaat??" when they find out that someone hooked up with them. See also "whudy"
"Giiiiirl WTF did you bring him home for?! That douche is such a whud!"