Top Definition
Someone that does one thing too much and too often.

1. Stop being a serder and play with us for a change.
2. Stop serding and come with us.
3. He's such a serderer

All the letters S E D E R are all in the same place of a keyboard. same place, same thing. thats the difinition of the word Serder.

by Johnathan Taylor September 06, 2007

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