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1.
Someone who spends a lot (and probably too much) time on message boards.
Example 1: Man, some of those FOBR boardies have over 15000 posts! They need a life!

Example 2: ...but I love those boards so much! The boardies are my friends! (etc, etc...)
by Leah [xclandestinexgirlx] May 19, 2006
 
2.
Anyone who spends a lot of time on a Postboard, and thinks they are better than everyone else on it.
Most weezer.com boardies act like they are better than everyone else on the board.
by Robyn July 30, 2003