The story
From method + air. From being a method to make it appear that the person has achieved a higher altitude than they actually have.
Etymology from Wiktionary, CC BY-SA 4.0.
method air
Today it means: A trick where the boarder grabs the heel edge of the board with their front hand, between their feet, and then pulls the board towards their back, while arching their back and bending knees. Full definition →