Somebody posted this entry to the Urban Dictionary. He probably made it all up, but I find the idea intriguing. He also misspelled "hole". I corrected that here.
Clij:
1) A mythical sexual organ, belonging to neither men nor women. Located in the same spot as the penis or vagina. It is a raised bump, with a hole in the center. The hole is 1-2 centimeters in circumference, and cannot be used for sexual intercourse.
2) An insult of the worst kind. Used to describe people who have no redeeming qualities.
1) "Hey, how much would it suck to have a clij instead of a penis? You wouldn't be able to do anything fun!"
2) "Yo, that Ev kid is such an unathletic, unfunny, awkward asshole." "Yea, he is a total clij!"
Now that's what humans need - a third sex. We've been stuck in binary mode much too long!