Face Plant - hitting the ground face first. "Joe hit a tree root and did a spectacular face plant." Synonyms: digger, soil sample, spring planting.

Fair Grunt - an expression exclusively used nonchalantly by others to describe a death march, in hopes others will try it, fail, and revere them as bike gods.

First Blood - credit to the first rider in a group who crashes and starts bleeding as a result.

Flip - When you pop a wheelie and pull your bike too high so that you fall on your back

Flying Trapeze -  when you endo into a clothesline.

Foot Fault -  when a rider can't disengage his cleats from the pedals before falling over.

Fred - 1) a person who spends a lot of money on his bike and clothing, but still can't ride. "What a fred -- too much Lycra and titanium and not enough skill." Synonym for poser. Occasionally called a "barney". 2) (from road riding) a person who has a mishmash of old gear, does't care at all about technology or fashion, didn't race or follow racing, etc. Often identified by chainring marks on white calf socks. Used by "serious" roadies to disparage utility cyclists and touring riders, especially after these totally unfashionable "freds" drop the "serious" roadies on hills because the "serious" guys were really posers. According to popular myth, "Fred" was a well-known grumpy old touring rider, who really was named Fred.

Front Wheelie - a trick where the rider applies the front brake and lifts the back wheel off the ground; this is the basis for many BMX tricks. Most riders cannot pedal effectively while doing a front wheelie. Also called a "nose wheelie" or "stoppie."

FS or F/S - an ambiguous term, can mean Front Suspension or Full Suspension. Not used by anyone who wishes to be understood.

F...Oops Can't say that word here. We are actually good people you know...