When a man ejaculates on the face of his partner under a black light. The light causes the salty maple syrup to glow while marinating on the victim's face, thus causing the beard shaped puddle to illuminate. Talented bearders can design mustaches and sideburns as well.
Jeb: Hey, how was the rave at 'Club Cage' last night?
Clarence: From what I remember it was a very special time. Karen and I reached a new point in our relationship because there were black lights in the bathroom as well. I convinced her to follow me in so I could finally give her a neon beard.
Jeb: That IS special, congratulations on the milestone, and tell Karen the same. How'd it turn out?
Clarence: I was so backed up that she ended up with a mustache like William Taft's, side-burns like Chester Arthur's, and a raging James Garfield beard.