Cassius is a dumb person who has no friends and is ugly, if he has friends they are all nerds. Except for one of them (my name is cassius and I approve this message)
A penis with a substantial curve to the left or right (Depending on the dominant hand) usually caused from obsessive and/or frequent masturbation. This primarily occurs in men who cannot get laid.
"Oh, he's definitely gotten himself a cassius by now."
"She can't even please her husband anymore, the poor man must have himself a cassius by now."