Top Definition
A person who is under a set age. "Underage User" may be used for forums, online games ect... Anywhere online where there is a set age you must be.
Bobby is 12. Bobby joins a 13+ forum. Mandy who is 14 and a staff member finds out- Mandy banns Bobby's arse =) and did it because he was a Underage User
by Ryaa July 18, 2006
U suck like a 12 yr old girl^^

by fucker August 21, 2003
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