These are common terms amongst the MTB'ers, and some are the same for BMX. Many BMX'ers ride MTB too.

Bail: Leaping off the bike to avoid a more serious crash. Best done into a soft pile of leaves at the side of a trail.

Berm: A banked corner that can be ridden faster than a flat corner. A very common trail feature.

Booter: A large jump that requires a lot of commitment.

BSO: Bike Shaped Object. A cheap bike designed to look like a mountain bike that would have no real off-road use. Usually dept store bikes.

Clean: To complete a section of trail without crashing, stopping or taking your feet off the pedals.

Dab: Quickly taking a foot off your pedal to stop yourself from crashing.

Dialled: When your set up is perfect allowing you to ride to the top of your ability.

Dope: Good.

Downside: A downwards-facing slope that allows you to gain extra speed, it will normally be after a jump.

Edit: A short film showcasing the talents of a rider or riders

Flow: The trail nirvana. A feeling all mountain bikers seek where one obstacle melds into another just perfectly. You know it when you’ve found it.

Gap: A jump with a hole in the middle, this increases the risk for the rider.

Gnarly: An especially difficult feature.

Huck: Performing a large jump without any real thought for the consequences.

Kicker: A steep jump that gives you a lot of airtime.

LBS: Local Bike Shop. Your go-to place for any repairs, upgrades or just a nice chat about bikes.

Loam: A specific type of loose, dry dirt. Desirable for its grippy characteristics and the ability to create roost.

Loose: To ride on the edge of control.

Northshore: Raised wooden board walks, named after the North Shore area of Vancouver that popularized this style of riding.

Pimp: Extremely nice bikes or components.

Pinned: To ride fast

Pump: A technique that allows you to gain speed without pedaling.

Rad: Good.

Rail: To ride a corner so well it is as if you are on rails.

Roost: Dirt that is kicked up behind a rider as they ride sideways into a corner.

Scrub: A motocross technique used to keep low and fast over a jump.

Session: To repeatedly ride a section until you have perfected it.

Shralp: To ride in an aggressive manner.

Shred: To ride in an aggressive manner.

Sick: Good

Snake Bite: A puncture that leaves two parallel holes like a snake’s fangs

Step-down: A jump where the landing is lower than the take-off.

Step-up: A jump where the landing is higher than the take-off.

Stoked: Excited.

Stoppie: A nose wheelie.

Tabletop: A jump with a flat layer of dirt across the top, this is thought to be safer than a double or gap jump.

Also, a trick where the bike is laid flat underneath the rider in the air.

Taco: When a wheel has been bent by an impact to the extent that it looks like a taco.

Whip: When the bike is pushed sideways in the air.

Yew: A general expression of excitement. Sam Pilgrim’s favorite riding word… yyyeeeewwwww!