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A term which is most applicable when used in Mountain Biking, but is still relevant otherwise. While riding along a trail behind someone, mostly, up a steep incline. The person in front decides not to continue to maintain their speed, but rather, allow their momentum to barely carry them over the apex, forcing the person behind the rider to either stop, eat their back tire, or in extreme cases, fly over their bars like superman.
I was about to fly past that newbie, but he wouldn't let me around and then coiffed me at the peak inside Little Razorback.

Don't coiff me, bro!!
by MTB guy August 15, 2011
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