It means retard because retort sounds like retard.
This definition is usually made by people in year 7 whilst learning about scientific equipment.
Guy 1: Dude go A.
Guy 2: Dude sud de fuc up, I'm going b
Guy 1: shush you retort stand, you can't even aim LoL.
Guy 2: Ahaha, got me there XD. Nice one
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