Well I'll personally call round and stab in the neck with a pair of scissors anyone who repies to a question to me with "Whatever" as the answer. If you can't be bothered to reply in English then f*** off, about as dismissive a reply to the person you are taking to as you can make.
nah, cartman is more, "respect MAR authoritah!" meh is what cats do, they just look at you as if to say f**k off, then walk away, like den says, shrugging your shoulders or "wot-eveeeeeeeeeeeeeeeeeeeeeer!"