Bike-Bum

When you cycle on a bicycle that has a REALLY hard and uncomfortable saddle, you'll be left with an annoying pain your backside that you will only feel when you sit on something, even the comfiest seat will hurt thanks to this hidden pain in your bottom.

It takes roughly 24 hours of not riding on that saddle again for it to go away. Depending on how loing you were cycling initially.
Dude #1: Why are you sitting so weird? You're on the single comfiest couch in all existence!

Dude #2: Got Bike-Bum. Even this heavenly sofa feels sore thanks to that cursed hard saddle!

Dude #1: 'Bummer!'
by Big Red Musey November 05, 2010
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Bum bike

Bum bike is any sort of bicycle that's been modified with a small internal combustion engine kit to act as crude but effective moped. They are usually unregulated in most areas.
They are usually operated by a the homeless or a junky who doesn't have a car or motorcycle. This is done usually with a stolen bike and used as a means to get around town quickly while out commiting crime. They are usually very loud since they are use a two stroke motor. When one hears the sound of droning two cycle engine you know the junkies coming around to steal anything that's not nailed down.
Hey Jim do you hear that noise ?!

Jim; yeah it sounds like a bum bike, I better go lock my shit up before it gets stolen

Hey, who's riding that noisey ass Moped?! Oh that's earl, he lost his license when he got a DUI so he made a bum bike so he can get to work.
by Anton H April 10, 2025
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