Top Definition
An atypical 49ers fan who tries to make himself/herself feel better by dissing other teams. They have extreme difficulty accepting reality, and often mistake past trophies for present-day success. They tend to fall back on general over-indulgence to compensate for their teams’ overall lack of awesomeness.

Niner Douches can typically be identified by their flashy, yet hideous red and gold apparel, over-grown facial hair (both male and female) and a cockiness that is mainly due to the fact that the 49ers are a sub-par team…At best.
Look at that drunk bastard in the Frank Gore jersey hitting on that ugly chick…He is a total Niner Douche.
by TD-Gal September 21, 2009
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