look up any word, like the eiffel tower:
 
1.
Someone who ruins a page of interesting definitions by posting the actual definition of said word.
Def 1. Sex - What kind of moron are you that you look up sex in the urban dictionary?

Def 2. Sex - 1) The act of intercourse

2) Another word for Gender

Much like how a person who ruins a party is called a party pooper, the person who wrote the second definition is a UD Pooper.
by yournameisalreadybeingusedbyso February 11, 2013