I always referred to it as the MCAT.
I think when people refer to it as the MCATs they are awakening the group dynamic-- that conduit between us all, our shared pain and pleasure with the test.
When I tell someone, "Yea the MCATs are comin' up in August" --- I awaken cries and woes of all my fellow sleepless premeds that will ache with me, for I am not alone.
When I say, "Yea the MCAT was ok" I am refering to my own trials and tribulations with the test.
When I say, "The MCATs suck ass" I am again evoking that grouply sense.
suffer yet?