Dearest Flippy,  It was clear since I got my first pair of cargo pants that cargo beep beep–possibly even vroom vroom, depending on the engine. Traingo pants, naturally, go choo choo. It should be noted, however, that choo choo is only a part of the traingo pants. Traingo pants also chugga chugga, which often precedes the aforementioned choo choo.  Boatpants, however, remain a trickier quandary to wrestle with. Boat does not go vroom or choo. Although I should note the