An erection you get from pure happiness. Completely non-sexual.
Guy 1: Dude, my girl got me Modern Warfare 2 before the release date!
Guy 2: Uhhh, check yourself dude
Guy 1: Don't worry, it's just a happy boner.
Horse Face Syndrome
When a male or female has a face that is too long and box-like, making her look like a horse.
Girl: Hey, do you wanna come to this party tonight.
Guy: Depends, is your friend gonna be there?
Guy: No. She has HFS, and I am NOT a jockey.