1.) A word you look up on Urban Dictionary when you're bored out of your mind.
2.) A word you make a define on Urban Dictionary when you have nothing to do.
3.) The third leg.
4.) That wibbly wobbly thing that should be hidden behind a closed door.
5.) The male genital
One who goes to urban dictionary to see what people have written about the word "penis", then decided that they should make a definition about penis too. the definition defining that a penis is one who describes a penis.
Random d00d: Hey "junior". Wanna go for a ride?
Not-so-random penis: Sure thing m8.
Random Chick: Count me in!
Random d00d: Wohooooo! High five!
Not-so-random penis: Right on! "slap"!