cock of shame
Just like a walk of shame, but with your cock. Especially, when your cock decides to be uncooperative and either you can't get it up at all OR you end up ejaculating too quickly. Then your girl is mad at you and you are ashamed of yourself.
John: So, the girl you took home with you last night, was she any good?
Paul: I don't know man...
John: Wtf do you meanmean by that?
Paul: Nothing dude, I totally had a cock of shame last night!
John: Oh, you poor thine! Here, take this blue pill next time.