Top Definition
(Adj) a supporter of the argentinean football team called Boca Juniors.

They usually live in slums, are thieves and make up the lowest parts of argentinean society.

They start running like hell as soon as they sense a River Plate supporter near them.
Today I came across a bloody bostero... thanks to God I wasn't touched by him.
by Pupito February 28, 2007
2 more definitions
(Adj) a smelly supporter of the argentinean football team called Boca Juniors.

They usually live in slums, are thieves and make up the lowest parts of argentinean society.

They start running like hell as soon as they sense a River Plate supporter near them.
Today I came across a bloody bostero... thanks to God I wasn't touched by him.
by Pupito February 25, 2007
Name given to supporters of Argentine football club Boca Juniors. The root word is bosta which means livestock feces. Over time they proudly refer themselves after this name.
Another riot was instigated by the rowdy bosteros.
by jackson cutler October 25, 2007

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