A giant, veiny, throbbing member. Usually at least 13 inches... In girth. Such phalluses are often deemed unsuitable for Intercourse with human women, and should therefore be used to pleasure only large land dwelling mammals (e.g. Elephants, hippopotamuses, robotic dinosaurs), or Ke$ha.

Often referred to as a great column
"Hi! Can I tear you apart with my massive horse cock??"

"fuck no. What do I look like, Ke$ha?! "

"Yes, a little bit. I mean, she's hot, in a slutty way."

"let me read some erotica while I eat French toast"
by Massivehorse March 10, 2016