Flappas are crude wings, attached to the side of the Pump Wagon, and flapped up and down by the actions of the crew. This allows the Pump Wagon to make short jumps as it bounces along, in order to avoid dangerous obstacles.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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A Pump Wagon fitted with flappas only has to take Dangerous Terrain tests if they end their move in Dangerous Terrain.