29er 

A mountain Bike with 29" wheels rather than the more traditional 26" wheels.

Oh man, My XXIX is a 29er! It eats up bumps and is a monster.

29er by Bun E April 11, 2007

29er 

Loose chick. Ok, this is a little out there, pay attention. Stock market crash on Black Tuesday in 1929 started the Great Depression. A 29er goes down faster than the stock market on Black Tuesday.

Hey, dude, can you give me your sister's number? I heard she's a real 29er.

29er by Bthomps October 21, 2004

29er 

A new type of mountain bike, that is pretty much the only real type of mountain bike in existence (sometimes with 29 inch wheels, sometimes not).

"What kind of bike is that?"
"29er, f'yeah!"

29er by saxproaj October 25, 2007

29er lag

What a 29er rider suffers from when they have shit fitness
Bobo stalled going over the hill because he has shit fitness and 29er lag

Ahhh that there is 29er lag

29er lag by Not BoBos Bush Bestie July 15, 2020