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Pronounced Bay-sick-ah and is the mating call of a western Canadian bird, Scarlet Macaw, but it is often used in slang terms to define something with a large penis for the Scarlet Macaw is known for it's larger than average penis size.
Girl 1: He was HUGE!
Girl 2: Was he Bosecke huge?!
by Bosecke April 10, 2009
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