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male blindness n. when a male rider watches a beautiful female ride over rough terrain and stares intensely at all the jiggling parts, making him too dizzy to see straight when it's his turn to ride the same terrain.

mandibular disharmony adv. how one's jaw feels when it and the handle bars attempt to occupy the same space and time. "Fuck!" "Pray, whats wrong?" "I've got mandibular disharmony."

mantrap n. hole covered with autumn leaves, resembling solid earth and effective at eating the front wheel of the unsuspecting rider.

Marin n. (muh RINN') the county in Northern California where MTBing is said to have been invented. Just north of the Golden Gate Bridge.

metal head n. see organ donor.

mo n. momentum. "If you don't get in gear at the bottom of that hill, you'll lose your mo."

mojo n. charm or icon worn by a biker or attached to the bike.

monkey-motion adj. magazine writer speak for a full-suspension bike.

MTB n. the activity of MounTain Biking. Or a mountain bike itself. v. "MTBing". See ATB, OHV, ORV, VTT.

mud diving n. what happens when a bike slows abruptly in mud, throwing the rider into wet goo.

mud-ectomy v. 1) a shower after a ride on a muddy trail. 2) the act of becoming clean.

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