Colloquial, casual word for a bicycle. Common in everyday speech, especially in Kansai region.
I'll go to the station by bike.
I bought a new bicycle.
child pickpocket
Dated slang for a child pickpocket. Rarely used in modern Japanese; the bicycle sense is overwhelmingly more common.
In an old novel, the word 'charinko' appeared, but it meant a child pickpocket, not a bicycle.