The back end of a rear load garbage truck, that is prone to squirting. Short for garbage pussy not trussy. Trussy is short for train pussy not trash pussy
My buddy walked behind one of them garbage trucks the other day and gotsoaked in shit from the garbussy
person1: βi donβt believe Andrew Garfield put his gardussy into spider-man.β
Person2: βhow dare you say that Andrew Garfield is the best spider-man! He really put his gardussy into Emma Stones death scene!β