Top Definition
(1) one who is a die-hard fan of the SanFransisco 49ers.
(2) having faith in the Niners through thick and thin and not jumping on the "band-wagon" just because another team won the latest superbowl.
"Dude, did you know 4ever9er hasn't missed a team game in over 25 years?"
by Anonymous June 19, 2003

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