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1.
a stupid person, not bright
person: whats 2x2?
other person: ummmmmmm... i dont know.
first person: wow what a lame brain.
von BLG3143 14. Oktober 2008
7 2
 
2.
Someone who posts nasty comments about someone they know on Urban Dictionary thinking that it will end up on the site.

Someone who is completely unaware of how unoriginal and lame it is to post negative comments about people they know on Urban Dictionary.
I enjoy editing Urban Dictionary posts but i get frustrated sometimes with the huge amount of lamebrains, twits, and meatheads posting completely useless bullshit. What a waste of my time, their time, and Urban Dictionary's bandwidth.
von CremeDeLaGherkin 24. Oktober 2008
4 3
 
3.
An total idiot.

see: scott whitson
Scott Whitson is a lamebrain
von jack 13. Dezember 2003
10 17