Prem

Premium or premier. This means something is very good. And better than normal.

"Ah mate, last night was prem". "This meal is prem"

McCalories

This pertains to the amount of calories there are in a McDonald's meal.

Person 1: OMG! There's so many Mccalories in this quarter pounder.

Person 2: Have you not tried using McDonald's McCalories counter?