Several meanings and uses. Usually used to describe something massive or immensely strong. Also a unit of measurement. Although the rate of one Grute changes frequently, one can safely assume one Grute will never be less than about 300 lbs.
Is the biggest ghetto in all of northern Norway. The people there are noisy, loud, rebellious and generally bad people. They are all wannabe gangsters, and speed all around town in their Volvo 240's. Can be used as an adjective.
Grue is a state of enlightenment and simultaneous praise of Gru from Despicable Me. So Grue is essentially a superior version of So True, whilst being a fan base/cult.