An extremely rare, but serious, medical condition. A "Cum Tooter" (or anal-seminal ejaculatory disease Also known as "ASED") is where a man ejaculates from his anus.
Only one out of every 1,265,987 (estimated) men are born with this "gift".
Jenny: Patty told me Mike was a cum tooter!
Chad: No way! I heard that was only a myth!
Jenny: It's for real! I saw it on Myth Busters!