National High School Mountain Bike Day 

June 27th, 2010
It's been the dream of all high school mountain bike racers, their coaches, parents, and close friends since the start of the first high school mountain bike league in 2000. Now, on June 27th, 2010, NICA (National Interscholastic Cycling Association) transformed from "idea" to legal fact with the filing of numerous forms. NICA is now a central governing organization in high school mountain bike racing in the United States. High School mountain bike racing is now considered an official, national sport.

June 27th, 2010 is the day that high school mountain biking is going to be celebrated by all whose it concerns.

Person 1: National High School Mountain Bike Day?? Mountain biking isn't a real sport!

Person 2: Check it, bro: (brings up CyclingNews.com article about high school mountain bike racing becoming an official sport) and don't hate

Person 1: ...Well, it's still lame.

National High School Mountain Bike Day by Mrs_Matthew_Bellamy July 5, 2010

mountain biker 

Mountain Biker is a shit house person who has OCD. OCD with MTB, shredding, trail cookies, bikes, mahalo, marlo and Whistler. OCD also with kamikaze, such as launching himself off big ass jumps.

Only rides park, dad only comes to witness first-hand where the ambulance will take him to this time.

Mountain biker somehow believes that riding around, shredding trails, forest surfing and eating trail cookies is more beneficial than finishing school. (AKA bro).
Common vocab used by mountain biker is mahalo, marlo, shred, trail cookies, shred hard ma dudes and im faster than you.

A mountain biker is a forest surfer who shreds.

mountain biker by JellypopJess June 10, 2017

Mountain Biker Water Break 

time taken when mountain biking to smoke pot

Hey Raeqwon, I'm gonna take a Mountain Biker Water Break quick.

Mountain Biker Water Break by R0BBI3 August 20, 2008

Mountain biker 

A dumbass who likes jumping off mountains on a bike.

Random dude: I saw an awesome mountain biker doing a wheelie down the road today!

Mountain biker by 00Ezeus75 November 7, 2019

mountain biker 

a mountain biker who looks hot asf when he’s racing or just going fast. likes to put bros before hoes at all times… especially when he’s out shredding trails

girl 1: wow that mountain biker looks so hot when he’s racing.
girl 2: yeah, it almost makes me wanna date him!

mountain biker by THEOFFICIALPPMAN July 5, 2021

Mountain biker

Someone who has a bike that casually goes down a hill reaching impossible speeds while the biker is having a lot of fun, these people usually tend to crash and say they “ case” the jump and will probably hit a massive jump

Wait are you a mountain biker? Yea I am I’m riding a canyon sender. Cool!

Mountain biker by Generallyepic November 19, 2025

MountainBiker 

a dumbass that likes jumping down mountains on a bike they are very hot and are very strong

I was riding in front of an epic MountainBiker

MountainBiker by BlackAce1313 September 11, 2019