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Someone who continues to use words and catchphrases that were once overly popular but now are rarely used at all.

Use of these phrases post-trend are now considered quite odd and often draw looks of derision and contempt from the listener.
Duncan: Have you seen that new TV show, it is pretty good.

Jasmine: Word

Duncan: Ugh Word? You're such a trend extender

Upon meeting someone

David: Waaaaassssssuppppp

Jake: fuckin trend extender
by Hawkeye Corrigan May 13, 2010