Top Definition
Someone who is riding their bicycle in dark/low visibility conditions, without a headlight or taillight. So-called because they are invisible, like a ninja.

The webcomic Yehuda Moon had a comic illustrating a bike ninja on April 14th.
I wasn't expecting to be out this late, so I didn't have my lights with me, and I was a bike ninja for the ride home.

When I crossed the intersection, I was almost hit by a bike ninja! Dude needs to get some lights and look where he's going.

#bicycle ninja #disco bike #disco bicycle #bicycles #bikes
by aprilstarchild May 23, 2008
Bike Ninjas are people who wear all black, and and become very ninja-looking when wearing a face mask / balaclava in cold weather. The all black also adds to their "invisibility" while riding at night (which can be dangerous). Bike Ninjas are often urban dwellers, ride fixed-gear or single-speed bikes, and are usually "hipsters" of some sort (hence the all black clothes).
"Some bikers wear all spandex, and others wear all black and look like Bike Ninjas."
#ninja #bike #bicycle #black #single-speed #hipster #fixed-gear
by lone sentry January 08, 2012
A bike cop, that hides in bushes and alley-ways looking for completely innocent students, and gives them MIP's etc.
Did you see that bike ninja tackle Eric a while ago.

Yea that ninja needs a stick poked through his spokes.
#mip #eric #tk's #sms #msu #idiots
by C MART October 05, 2005
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