Hung Nerd
A Man who looks like a geek or dork; often he wears things like glasses, overalls, pocket protectors etc., But beneath his trousers he's hiding a massive genitalia.
"Ronald looks like such a dweeb carrying that Star trek trapper keeper everywhere." "Yeah, but Jennifer saw him in his little cross country shorts the other day in gym class, he looked like he was smuggling a swollen grapefruit between his legs; I think he might be a hung nerd."