in addition to meaning more rad, this can also mean the opposite. Radder can describe a short, on the brink of being a midget girl who is very loud and obnoxious, mainly in public places. attracts attention to where attention is not wanted. Usually a Radder has heavy make up and dresses towards to 80's revival.
-Damn that Radder is obnoxious.
-Let's get up and move over to that table, so no one will look over and see us near her.
by Ross Welborn January 17, 2005

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Top Definition
To be more Radical
I'm way radder than you're sorry ass, chump.
by Treg July 31, 2003

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