Used to call BS on someone's story. Refers to the scene in "Billy Madison" where Chris Farley starts to tell Adam Sandler that he hooked up with Veronica.
"That Veronica Vaughn is one piece of ace, I know from experience dude. If you know what I mean. Billy Madison: No, you don't..."
Telling a BS story is also refered to as "Veronica Vaughnin'."
Billy: "So these 4 guys jumped out of the truck and started throwing hands up at me. I jumped out and just started swinging. After a few judy chops and knocking one out the rest started running, jumped back into their truck and drove off without him."
Bobby: "That Veronica Vaughn..."
Billy: "No, really man. This went down right out front of the club last night.
Bobby: I hope you haven't told anyone else this because I'm not the only one who will know you're Veronica Vaughnin.