The Great Gatsby, persistent undergraduate

I'd like to know if "persistent" in this excerpt from the chapter Three of The Great Gatsby means "leech" and if "violent" means "bawdy" or something like that:

The first supper—there would be another one after midnight—was now being served and Jordan invited me to join her own party who were spread around a table on the other side of the garden. There were three married couples and Jordan’s escort, a persistent undergraduate given to violent innuendo and obviously under the impression that sooner or later Jordan was going to yield him up her person to a greater or lesser degree.

Thank you.