1) A comic book character.
2) A boy a family member brings that no one in the family likes. Often shady looking, dressing in cream colored suits, with a carat and a half of cubic zirconium in their ear, and tend to chew gum obnoxiously.
Also spelled corn winkle
Jordan: Hey, who's that kid you brought, Sharon?
Sharon: Him? That's Chuck!
Jordan: Chuck? He seems kinda shady to me.
Sharon: Nah, he's pretty cool.
(One hour later)
Jordan: Hey, Cornwinkle! What are you still doing here?
Chuck/Cornwinkle: I was invited?
Sharon: Cornwinkle, go home! Take my car, and go!
Jordan: Did you just send Cornwinkle home?
Sharon: Yeah, he seemed pretty shady.