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1. Name given to the bus which picks up retarded people or those with 'special needs' and transports them to any given destination; usually a special school or a day trip to the seaside. The bus is normally decorated with a happy colourful scene, such as a beach, or a row of sunflowers or just very bright colours. The sole purpose of this is to create a happy atmosphere for a happy day out.
2. People who are particularly drunk or wasted on drugs.
Those people over there are definitely on the happy bus.
by veryoddsocks March 06, 2006
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