Term used to describe the condition of a persons manhood after it has been subjected to a long night of sexual intercourse (usually without a condom), or over-enthusiastic masturbation. Normally red, throbbing and sore to the touch.
Oli: Did you have a good time with that slut last night then?
Mark: Yeah but my dick is so sore today.
Mark: Nah mate probs just a severe case of athletes penis.