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Beef and the Chums are a gang of bikers that first appear in the episode Lost in Transportation, after Mikey was upset when there no more room left in Lily's room so he tries to find his way to the park, but accidentally ends up in the coffee shop with a gang full of bikers, they try to attack him but Mikey uses his kung fu moves and they make him an honorary chum, and give him a motorcycle and a whistle.
They were later seen in Hog Day Afternoon.