fixie: a fixed gear bike or the rider of a fixed gear bike

conversion: making your bike a geared bike to a fixed or singlespeed bike.

beater bike: the old bike you love that looks like you took it off a trash heap but ride it anyway...generally to run errands...

weight weenie: person who watches grams/weight of their bike (I've got to focus on my own weight before I go there )

someone asked about the term: endo: I believe it is short for "end over" the front of the bike. a mtn bike term

Can someone tell me what "Fred" means? I get the impression it is an insult, but I do not know how nor where it came from.