Unfortunate Nip-Slip

The unpleasant moment that occurs when a mans "scrumptious hard nipples" appear through his tight shirt. This moment can be made much worse when the man bears "man-titties". This appearance will normally cause cringe, disgust, or hilarity to others.

Patrick: Bro, did you see that? That sight will never leave my mind.
Juan: Damn what'd I miss?
Patrick: I just witnessed an unfortunate nip-slip