To break a contract; To walk out on teammates and fans alike like a coward without informing them.
Originated from when former Australian Rugby League player Sonny Bill Williams walked out of the Bulldogs Rugby League club after he was one year into a five year contract. He got on a plane bound for France without informing any of his teammates or fans.
Man #1: Did you here, Garry left the company after he was only half way through his contract. He got an offer from our rival company.
Man #2: He chucked a Sonny Bill!
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